[RFC V2 0/3] add decode command (SPD EEPROM data decoder)

[RFC V2 0/3] add decode command (SPD EEPROM data decoder)

[Alexander Smirnov]

Alexander Smirnov (3):
  common: move DDR_SPD to common/Kconfig
  ddr_spd: add routune for printing SPD contents in human readable
    format
  add decode command (SPD EEPROM data decoder)

 arch/ppc/mach-mpc85xx/Kconfig |   4 -
 commands/Kconfig              |   7 ++
 commands/Makefile             |   1 +
 commands/decode.c             |  65 +++++++++++
 common/Kconfig                |   4 +
 common/ddr_spd.c              | 245 ++++++++++++++++++++++++++++++++++++++++++
 include/ddr_spd.h             |   1 +
 7 files changed, 323 insertions(+), 4 deletions(-)
 create mode 100644 commands/decode.c

-- 
2.1.4


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[RFC V2 1/3] common: move DDR_SPD to common/Kconfig

[Alexander Smirnov]

This patch makes it possible to use ddr_spd-related
routines in any arch not only in ppc.

Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
---
 arch/ppc/mach-mpc85xx/Kconfig | 4 ----
 common/Kconfig                | 4 ++++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/ppc/mach-mpc85xx/Kconfig b/arch/ppc/mach-mpc85xx/Kconfig
index e29be9c..aa518b9 100644
--- a/arch/ppc/mach-mpc85xx/Kconfig
+++ b/arch/ppc/mach-mpc85xx/Kconfig
@@ -81,10 +81,6 @@ config P1022
 config MPC8544
 	bool
 
-config DDR_SPD
-	bool
-	select CRC16
-
 config FSL_DDR2
 	bool
 
diff --git a/common/Kconfig b/common/Kconfig
index 925fe4b..91e4ef3 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -941,3 +941,7 @@ endmenu
 
 config HAS_DEBUG_LL
 	bool
+
+config DDR_SPD
+	bool
+	select CRC16
-- 
2.1.4


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Re: [RFC V2 1/3] common: move DDR_SPD to common/Kconfig

[Renaud Barbier]

There may be an issue in the future. DDR_SPD selects the PPC Freescale
DDR driver support (my fault for this bad choice). If somebody was to
add and build a PPC machine with DDR support that is none of the
Freescale boards then the Freescale DDR driver will be selected too.

To be safe, something like that could be used:

diff --git a/arch/ppc/mach-mpc85xx/Makefile b/arch/ppc/mach-mpc85xx/Makefile
index 3e64617..a7453f7 100644
--- a/arch/ppc/mach-mpc85xx/Makefile
+++ b/arch/ppc/mach-mpc85xx/Makefile
@@ -9,5 +9,6 @@ obj-y                   += fsl_i2c.o
 obj-$(CONFIG_MP)       += mp.o
 obj-$(CONFIG_OFTREE)   += fdt.o
 obj-$(CONFIG_DRIVER_NET_GIANFAR) += eth-devices.o
-obj-$(CONFIG_DDR_SPD)  += ../ddr-8xxx/
+obj-$(CONFIG_FSL_DDR2) += ../ddr-8xxx/
+obj-$(CONFIG_FSL_DDR3) += ../ddr-8xxx/


On 24/06/2015 13:57, Alexander Smirnov wrote:
> This patch makes it possible to use ddr_spd-related
> routines in any arch not only in ppc.
> 
> Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
> ---
>  arch/ppc/mach-mpc85xx/Kconfig | 4 ----
>  common/Kconfig                | 4 ++++
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/ppc/mach-mpc85xx/Kconfig b/arch/ppc/mach-mpc85xx/Kconfig
> index e29be9c..aa518b9 100644
> --- a/arch/ppc/mach-mpc85xx/Kconfig
> +++ b/arch/ppc/mach-mpc85xx/Kconfig
> @@ -81,10 +81,6 @@ config P1022
>  config MPC8544
>  	bool
>  
> -config DDR_SPD
> -	bool
> -	select CRC16
> -
>  config FSL_DDR2
>  	bool
>  
> diff --git a/common/Kconfig b/common/Kconfig
> index 925fe4b..91e4ef3 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -941,3 +941,7 @@ endmenu
>  
>  config HAS_DEBUG_LL
>  	bool
> +
> +config DDR_SPD
> +	bool
> +	select CRC16
> 


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[RFC V2 2/3] ddr_spd: add routune for printing SPD contents in human readable format

[Alexander Smirnov]

Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
---
 common/ddr_spd.c  | 245 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/ddr_spd.h |   1 +
 2 files changed, 246 insertions(+)

diff --git a/common/ddr_spd.c b/common/ddr_spd.c
index ea0b529..8a98cc4 100644
--- a/common/ddr_spd.c
+++ b/common/ddr_spd.c
@@ -61,3 +61,248 @@ uint32_t ddr3_spd_checksum_pass(const struct ddr3_spd_eeprom_s *spd)
 
 	return 0;
 }
+
+static char *heights[] = {
+	"<25.4",
+	"25.4",
+	"25.4 - 30.0",
+	"30.0",
+	"30.5",
+	"> 30.5"
+};
+
+static char *sdram_voltage_interface_level[] = {
+	"TTL (5V tolerant)",
+	"LVTTL (not 5V tolerant)",
+	"HSTL 1.5V",
+	"SSTL 3.3V",
+	"SSTL 2.5V",
+	"SSTL 1.8V"
+};
+
+static char *ddr2_module_types[] = {
+	"RDIMM (133.35 mm)",
+	"UDIMM (133.25 mm)",
+	"SO-DIMM (67.6 mm)",
+	"Micro-DIMM (45.5 mm)",
+	"Mini-RDIMM (82.0 mm)",
+	"Mini-UDIMM (82.0 mm)"
+};
+
+static char *refresh[] = {
+	"15.625",
+	"3.9",
+	"7.8",
+	"31.3",
+	"62.5",
+	"125"
+};
+
+static char *type_list[] = {
+	"Reserved",
+	"FPM DRAM",
+	"EDO",
+	"Pipelined Nibble",
+	"SDR SDRAM",
+	"Multiplexed ROM",
+	"DDR SGRAM",
+	"DDR SDRAM",
+	"DDR2 SDRAM",
+	"FB-DIMM",
+	"FB-DIMM Probe",
+	"DDR3 SDRAM"
+};
+
+static int funct(uint8_t addr)
+{
+	int t;
+
+	t = ((addr >> 4) * 10 + (addr & 0xf));
+
+	return t;
+}
+
+
+static int des(uint8_t byte)
+{
+	int k;
+
+	k = (byte & 0x3) * 10 / 4;
+
+	return k;
+}
+
+static int integ(uint8_t byte)
+{
+	int k;
+
+	k = (byte >> 2);
+
+	return k;
+}
+
+static int ddr2_sdram_ctime(uint8_t byte)
+{
+	int ctime;
+
+	ctime = (byte >> 4) * 100;
+	if ((byte & 0xf) <= 9) {
+		ctime += (byte & 0xf) * 10;
+	} else if ((byte & 0xf) == 10) {
+		ctime += 25;
+	} else if ((byte & 0xf) == 11) {
+		ctime += 33;
+	} else if ((byte & 0xf) == 12) {
+		ctime += 66;
+	} else if ((byte & 0xf) == 13) {
+		ctime += 75;
+	}
+	return ctime;
+}
+
+void prin(uint8_t *record)
+{
+	int highestCAS = 0;
+	int cas[256];
+	int i, i_i, k, x, y;
+	int ddrclk, tbits, pcclk;
+	int trcd, trp, tras;
+	int ctime;
+	uint8_t parity;
+	char *ref;
+
+	ctime = ddr2_sdram_ctime(record[9]);
+	ddrclk = 2 * (1000 / ctime) * 100;
+	tbits = (record[7] << 8) + record[6];
+	if ((record[11] & 0x03) == 1) {
+		tbits = tbits - 8;
+	}
+	pcclk = ddrclk * tbits / 8;
+	pcclk = pcclk - (pcclk % 100);
+	i_i = (record[3] & 0x0f) + (record[4] & 0x0f) - 17;
+	k = ((record[5] & 0x7) + 1) * record[17];
+	trcd = ((record[29] >> 2) + ((record[29] & 3) * 0.25)) / ctime * 100;
+	trp = ((record[27] >> 2) + ((record[27] & 3) * 0.25)) / ctime * 100;
+	tras = record[30] * 100 / ctime ;
+	x = (int)(ctime / 100);
+	y = (ctime - (int)((ctime / 100) * 100)) / 10;
+
+	for (i_i = 2; i_i < 7; i_i++) {
+		if (record[18] & (1 << i_i)) {
+			highestCAS = i_i;
+		cas[highestCAS]++;
+		}
+	}
+
+	printf("---=== SPD EEPROM Information ===---\n");
+	printf("EEPROM Checksum of bytes 0-62\t\t\t OK (0x%0X)\n", record[63]);
+	printf("# of bytes written to SDRAM EEPROM\t\t %d\n", record[0]);
+	printf("Total number of bytes in EEPROM\t\t\t %d\n", 1 << record[1]);
+
+	if (record[2] < 11) {
+		printf("Fundamental Memory type\t\t\t\t %s\n", type_list[record[2]]);
+	} else {
+		printf("Warning: unknown memory type (%02x)\n", record[2]);
+	}
+	printf("SPD Revision\t\t\t\t\t %x.%x\n", record[62] >> 4, record[62] & 0x0f);
+
+	printf("\n---=== Memory Characteristics ===---\n");
+	printf("Maximum module speed\t\t\t\t %d MHz (PC2-%d)\n", ddrclk, pcclk);
+	if (i_i > 0 && i_i <= 12 && k > 0) {
+		printf("Size\t\t\t\t\t\t %d MB\n", ((1 << i_i) * k));
+	} else {
+		printf("Size\t\t\t\t\t\t INVALID: %02x %02x %02x %02x\n", record[3], record[4], record[5], record[17]);
+	}
+	printf("Banks x Rows x Columns x Bits\t\t\t %d x %d x %d x %d\n", record[17], record[3], record[4], record[6]);
+	printf("Ranks\t\t\t\t\t\t %d\n", (record[5] & 0x7) + 1);
+	printf("SDRAM Device Width\t\t\t\t %d bits\n", record[13]);
+
+	if ((record[5] >> 5) < 7) {
+		printf("Module Height\t\t\t\t\t %s mm\n", heights[(record[5] >> 5)]);
+	} else {
+		printf("Error height\n");
+	}
+	printf("Module Type\t\t\t\t\t %s\n", ddr2_module_types[fls(record[20]) - 1]);
+	printf("DRAM Package\t\t\t\t\t ");
+	if ((record[5] & 0x10) == 1) {
+		printf("Stack\n");
+	} else {
+		printf("Planar\n");
+	}
+	if (record[8] < 7) {
+		printf("Voltage Interface Level\t\t\t\t %s\n", sdram_voltage_interface_level[record[8]]);
+	} else {
+		printf("Error Voltage Interface Level\n");
+	}
+	printf("Module Configuration Type \t\t\t ");
+
+	parity = record[11] & 0x07;
+	if (parity == 0) {
+		printf("No Parity\n");
+	}
+	if ((parity & 0x03) == 0x01) {
+		printf("Data Parity\n");
+	}
+	if (parity & 0x02) {
+		printf("Data ECC\n");
+	}
+	if (parity & 0x04) {
+		printf("Address/Command Parity\n");
+	}
+	if ((record[12] >> 7) == 1) {
+		ref = "- Self Refresh";
+	} else {
+		ref = " ";
+	}
+	printf("Refresh Rate\t\t\t\t\t Reduced (%s us) %s\n", refresh[record[12] & 0x7f], ref);
+	printf("Supported Burst Lengths\t\t\t\t %d, %d\n", record[16] & 4, record[16] & 8);
+
+	printf("Supported CAS Latencies (tCL)\t\t\t %dT\n", highestCAS);
+	printf("tCL-tRCD-tRP-tRAS\t\t\t\t %d-%d-%d-%d as DDR2-%d\n", highestCAS, trcd, trp, tras, ddrclk);
+	printf("Minimum Cycle Time\t\t\t\t %d.%d ns at CAS %d\n", x, y, highestCAS);
+	printf("Maximum Access Time\t\t\t\t 0.%d%d ns at CAS %d\n", (record[10] >> 4), (record[10] & 0xf), highestCAS);
+	printf("Maximum Cycle Time (tCK max)\t\t\t %d ns\n", (record[43] >> 4) + (record[43] & 0x0f));
+
+	printf("\n---=== Timing Parameters ===---\n");
+	printf("Address/Command Setup Time Before Clock (tIS)\t 0.%d ns\n", (funct(record[32])));
+	printf("Address/Command Hold Time After Clock (tIH)\t 0.%d ns\n", (funct(record[33])));
+	printf("Data Input Setup Time Before Strobe (tDS)\t 0.%d%d ns\n", (record[34] >> 4), (record[34] & 0xf));
+	printf("Data Input Hold Time After Strobe (tDH)\t\t 0.%d%d ns\n", (record[35] >> 4), (record[35] & 0xf));
+
+	printf("Minimum Row Precharge Delay (tRP)\t\t %d.%d ns\n", integ(record[27]), des(record[27]));
+	printf("Minimum Row Active to Row Active Delay (tRRD)\t %d.%d ns\n", integ(record[28]), des(record[28]));
+	printf("Minimum RAS# to CAS# Delay (tRCD)\t\t %d.%d ns\n", integ(record[29]), des(record[29]));
+	printf("Minimum RAS# Pulse Width (tRAS)\t\t\t %d ns\n", ((record[30] & 0xfc) + (record[30] & 0x3)));
+	printf("Write Recovery Time (tWR)\t\t\t %d.%d ns\n", integ(record[36]), des(record[36]));
+	printf("Minimum Write to Read CMD Delay (tWTR)\t\t %d.%d ns\n", integ(record[37]), des(record[37]));
+	printf("Minimum Read to Pre-charge CMD Delay (tRTP)\t %d.%d ns\n", integ(record[38]), des(record[38]));
+	printf("Minimum Active to Auto-refresh Delay (tRC)\t %d ns\n", record[41]);
+	printf("Minimum Recovery Delay (tRFC)\t\t\t %d ns\n", record[42]);
+	printf("Maximum DQS to DQ Skew (tDQSQ)\t\t\t 0.%d ns\n", record[44]);
+	printf("Maximum Read Data Hold Skew (tQHS)\t\t 0.%d ns\n", record[45]);
+
+	printf("\n---=== Manufacturing Information ===---\n");
+
+	printf("Manufacturer JEDEC ID\t\t\t\t");
+	for (i = 64; i < 72; i++) {
+		printf(" %02x", record[i]);
+	}
+	printf("\n");
+	if (record[72]) {
+		printf("Manufacturing Location Code\t\t\t 0x%02x\n", record[72]);
+	}
+	printf("Part Number\t\t\t\t\t ");
+	for (i = 73; i < 91; i++) {
+		if (record[i] >= 32 && record[i] < 127) {
+			printf("%c", record[i]);
+		} else {
+			printf("%d", record[i]);
+		}
+	}
+	printf("\n");
+	printf("Manufacturing Date\t\t\t\t 20%d-W%d\n", record[93], record[94]);
+	printf("Assembly Serial Number\t\t\t\t 0x");
+	for (i = 95; i < 99; i++) {
+		printf("%02X", record[i]);
+	}
+}
diff --git a/include/ddr_spd.h b/include/ddr_spd.h
index fc03bac..1c308ef 100644
--- a/include/ddr_spd.h
+++ b/include/ddr_spd.h
@@ -228,6 +228,7 @@ struct ddr3_spd_eeprom_s {
 	uint8_t cust[80];        /* 176-255 Open for Customer Use */
 };
 
+extern void prin(uint8_t *record);
 extern uint32_t ddr3_spd_checksum_pass(const struct ddr3_spd_eeprom_s *spd);
 extern uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd);
 
-- 
2.1.4


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Re: [RFC V2 2/3] ddr_spd: add routune for printing SPD contents in human readable format

[Sascha Hauer]

On Wed, Jun 24, 2015 at 03:57:28PM +0300, Alexander Smirnov wrote:
> Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
> ---
> +void prin(uint8_t *record)

Please use a more meaningful name.

> +{
> +	int highestCAS = 0;
> +	int cas[256];
> +	int i, i_i, k, x, y;
> +	int ddrclk, tbits, pcclk;
> +	int trcd, trp, tras;
> +	int ctime;
> +	uint8_t parity;
> +	char *ref;
> +
> +	ctime = ddr2_sdram_ctime(record[9]);
> +	ddrclk = 2 * (1000 / ctime) * 100;
> +	tbits = (record[7] << 8) + record[6];
> +	if ((record[11] & 0x03) == 1) {
> +		tbits = tbits - 8;
> +	}
> +	pcclk = ddrclk * tbits / 8;
> +	pcclk = pcclk - (pcclk % 100);
> +	i_i = (record[3] & 0x0f) + (record[4] & 0x0f) - 17;
> +	k = ((record[5] & 0x7) + 1) * record[17];
> +	trcd = ((record[29] >> 2) + ((record[29] & 3) * 0.25)) / ctime * 100;
> +	trp = ((record[27] >> 2) + ((record[27] & 3) * 0.25)) / ctime * 100;
> +	tras = record[30] * 100 / ctime ;
> +	x = (int)(ctime / 100);
> +	y = (ctime - (int)((ctime / 100) * 100)) / 10;
> +
> +	for (i_i = 2; i_i < 7; i_i++) {
> +		if (record[18] & (1 << i_i)) {
> +			highestCAS = i_i;
> +		cas[highestCAS]++;
> +		}

indention broken here.

> +	}
> +
> +	printf("---=== SPD EEPROM Information ===---\n");
> +	printf("EEPROM Checksum of bytes 0-62\t\t\t OK (0x%0X)\n", record[63]);
> +	printf("# of bytes written to SDRAM EEPROM\t\t %d\n", record[0]);
> +	printf("Total number of bytes in EEPROM\t\t\t %d\n", 1 << record[1]);
> +
> +	if (record[2] < 11) {
> +		printf("Fundamental Memory type\t\t\t\t %s\n", type_list[record[2]]);
> +	} else {
> +		printf("Warning: unknown memory type (%02x)\n", record[2]);
> +	}

Please drop unnecessary braces here and elsewhere.

Sascha

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[RFC V2 3/3] add decode command (SPD EEPROM data decoder)

[Alexander Smirnov]

decode-dimms perl script is used as prototype
(see https://github.com/groeck/i2c-tools/blob/master/eeprom/decode-dimms).

Here is a sample decode output:

barebox@barebox sandbox:/ decode env/crucial_pc2-6400_ddr2
Decoding EEPROM: env/crucial_pc2-6400_ddr2

---=== SPD EEPROM Information ===---
EEPROM Checksum of bytes 0-62			 OK (0xCA)
Total number of bytes in EEPROM			 256
Fundamental Memory type				 DDR2 SDRAM
SPD Revision					 1.3

---=== Memory Characteristics ===---
Maximum module speed				 800 MHz (PC2-6400)
Size						 1024 MB
Banks x Rows x Columns x Bits			 8 x 14 x 10 x 64
Ranks						 1
SDRAM Device Width				 8 bits
Module Height					 30.0 mm
Module Type					 SO-DIMM (67.6 mm)
DRAM Package					 Planar
Voltage Interface Level				 SSTL 1.8V
Module Configuration Type 			 No Parity
Refresh Rate					 Reduced (7.8 us) - Self Refresh
Supported Burst Lengths				 4, 8
Supported CAS Latencies (tCL)			 6T
tCL-tRCD-tRP-tRAS				 6-6-6-18 as DDR2-800
Minimum Cycle Time				 250 (ns*100) at CAS 6
Maximum Access Time				 4 (ns*10) at CAS 6
Maximum Cycle Time (tCK max)			 8 ns

---=== Timing Parameters ===---
Address/Command Setup Time Before Clock (tIS)	 17 (ns*100)
Address/Command Hold Time After Clock (tIH)	 25 (ns*100)
Data Input Setup Time Before Strobe (tDS)	 5 (ns*100)
Data Input Hold Time After Strobe (tDH)		 12 (ns*100)
Minimum Row Precharge Delay (tRP)		 150 (ns*10)
Minimum Row Active to Row Active Delay (tRRD)	 75 (ns*10)
Minimum RAS# to CAS# Delay (tRCD)		 150 (ns*10)
Minimum RAS# Pulse Width (tRAS)			 450 (ns*10)
Write Recovery Time (tWR)			 150 (ns*10)
Minimum Write to Read CMD Delay (tWTR)		 75 (ns*10)
Minimum Read to Pre-charge CMD Delay (tRTP)	 75 (ns*10)
Minimum Active to Auto-refresh Delay (tRC)	 600 (ns*10)
Minimum Recovery Delay (tRFC)			 1270 (ns*10)
Maximum DQS to DQ Skew (tDQSQ)			 20 (ns*100)
Maximum Read Data Hold Skew (tQHS)		 30 (ns*100)

---=== Manufacturing Information ===---
Manufacturer JEDEC ID				 7f 7f 7f 7f 7f 9b 00 00
Part Number					 CT12864AC800.M8FM8
Manufacturing Date				 2014-W24
Assembly Serial Number				 0x00000000

TODOs:

  * Timing Parameters section output format is slightly
    differ from decode-dimms' format;
  * supports only DDR2 SPD EEPROM.

Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
---
 commands/Kconfig  |  7 ++++++
 commands/Makefile |  1 +
 commands/decode.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)

diff --git a/commands/Kconfig b/commands/Kconfig
index bb6674e..9230873 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -2102,6 +2102,13 @@ config CMD_STATE
 	depends on STATE
 	prompt "state"
 
+config CMD_DECODE
+	tristate
+	prompt "decode"
+	select DDR_SPD
+	help
+	  decode spd eeprom
+
 # end Miscellaneous commands
 endmenu
 
diff --git a/commands/Makefile b/commands/Makefile
index 3698347..71cd877 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -112,3 +112,4 @@ obj-$(CONFIG_CMD_NV)		+= nv.o
 obj-$(CONFIG_CMD_DEFAULTENV)	+= defaultenv.o
 obj-$(CONFIG_CMD_STATE)		+= state.o
 obj-$(CONFIG_CMD_DHCP)		+= dhcp.o
+obj-$(CONFIG_CMD_DECODE)	+= decode.o
diff --git a/commands/decode.c b/commands/decode.c
new file mode 100644
index 0000000..80da80c
--- /dev/null
+++ b/commands/decode.c
@@ -0,0 +1,65 @@
+#include <fcntl.h>
+#include <common.h>
+#include <getopt.h>
+#include <command.h>
+#include <envfs.h>
+#include <errno.h>
+#include <fs.h>
+#include <libfile.h>
+#include <malloc.h>
+#include <globalvar.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ddr_spd.h>
+
+void dump(uint8_t *addr, int len)
+{
+	int i;
+
+	printf("\t 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f\n\n");
+
+	for (i = 0; i < len; i++) {
+		if ((i % 0x10) == 0x00) {
+			printf("%07x:", i);
+		}
+		printf(" %02x", addr[i]);
+		if ((i % 0x10) == 0xf) {
+			printf("\n");
+		}
+	}
+
+	printf("\n");
+}
+
+static int do_decode(int argc, char *argv[])
+{
+	int fp;
+	uint8_t record[256];
+
+	if (argc != 2) {
+		return COMMAND_ERROR_USAGE;
+	}
+
+	fp = open(argv[1], O_RDONLY);
+
+	if (fp < 0) {
+		printf("could not open %s: %s\n", argv[args], errno_str());
+	}
+
+	read(fp, &record[0], 256);
+	close(fp);
+
+	printf("Decoding EEPROM: %s\n\n", argv[1]);
+
+	prin(record);
+	printf("\n\n");
+
+	return 0;
+}
+BAREBOX_CMD_HELP_START(decode)
+BAREBOX_CMD_HELP_TEXT("Not enough or more than one argument to continue.")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(decode)
+	.cmd            = do_decode,
+BAREBOX_CMD_END
-- 
2.1.4


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Re: [RFC V2 3/3] add decode command (SPD EEPROM data decoder)

[Antony Pavlov]

On Wed, 24 Jun 2015 15:57:29 +0300
Alexander Smirnov <alllecs@yandex.ru> wrote:

> decode-dimms perl script is used as prototype
> (see https://github.com/groeck/i2c-tools/blob/master/eeprom/decode-dimms).
> 
> Here is a sample decode output:
> 
> barebox@barebox sandbox:/ decode env/crucial_pc2-6400_ddr2
> Decoding EEPROM: env/crucial_pc2-6400_ddr2
> 
> ---=== SPD EEPROM Information ===---
> EEPROM Checksum of bytes 0-62			 OK (0xCA)
> Total number of bytes in EEPROM			 256
> Fundamental Memory type				 DDR2 SDRAM
> SPD Revision					 1.3
> 
> ---=== Memory Characteristics ===---
> Maximum module speed				 800 MHz (PC2-6400)
> Size						 1024 MB
> Banks x Rows x Columns x Bits			 8 x 14 x 10 x 64
> Ranks						 1
> SDRAM Device Width				 8 bits
> Module Height					 30.0 mm
> Module Type					 SO-DIMM (67.6 mm)
> DRAM Package					 Planar
> Voltage Interface Level				 SSTL 1.8V
> Module Configuration Type 			 No Parity
> Refresh Rate					 Reduced (7.8 us) - Self Refresh
> Supported Burst Lengths				 4, 8
> Supported CAS Latencies (tCL)			 6T
> tCL-tRCD-tRP-tRAS				 6-6-6-18 as DDR2-800
> Minimum Cycle Time				 250 (ns*100) at CAS 6
> Maximum Access Time				 4 (ns*10) at CAS 6
> Maximum Cycle Time (tCK max)			 8 ns
> 
> ---=== Timing Parameters ===---
> Address/Command Setup Time Before Clock (tIS)	 17 (ns*100)
> Address/Command Hold Time After Clock (tIH)	 25 (ns*100)
> Data Input Setup Time Before Strobe (tDS)	 5 (ns*100)
> Data Input Hold Time After Strobe (tDH)		 12 (ns*100)
> Minimum Row Precharge Delay (tRP)		 150 (ns*10)
> Minimum Row Active to Row Active Delay (tRRD)	 75 (ns*10)
> Minimum RAS# to CAS# Delay (tRCD)		 150 (ns*10)
> Minimum RAS# Pulse Width (tRAS)			 450 (ns*10)
> Write Recovery Time (tWR)			 150 (ns*10)
> Minimum Write to Read CMD Delay (tWTR)		 75 (ns*10)
> Minimum Read to Pre-charge CMD Delay (tRTP)	 75 (ns*10)
> Minimum Active to Auto-refresh Delay (tRC)	 600 (ns*10)
> Minimum Recovery Delay (tRFC)			 1270 (ns*10)
> Maximum DQS to DQ Skew (tDQSQ)			 20 (ns*100)
> Maximum Read Data Hold Skew (tQHS)		 30 (ns*100)
> 
> ---=== Manufacturing Information ===---
> Manufacturer JEDEC ID				 7f 7f 7f 7f 7f 9b 00 00
> Part Number					 CT12864AC800.M8FM8
> Manufacturing Date				 2014-W24
> Assembly Serial Number				 0x00000000
> 
> TODOs:
> 
>   * Timing Parameters section output format is slightly
>     differ from decode-dimms' format;
>   * supports only DDR2 SPD EEPROM.
> 
> Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
> ---
>  commands/Kconfig  |  7 ++++++
>  commands/Makefile |  1 +
>  commands/decode.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 73 insertions(+)
> 
> diff --git a/commands/Kconfig b/commands/Kconfig
> index bb6674e..9230873 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -2102,6 +2102,13 @@ config CMD_STATE
>  	depends on STATE
>  	prompt "state"
>  
> +config CMD_DECODE
> +	tristate
> +	prompt "decode"
> +	select DDR_SPD
> +	help
> +	  decode spd eeprom
> +
>  # end Miscellaneous commands
>  endmenu
>  
> diff --git a/commands/Makefile b/commands/Makefile
> index 3698347..71cd877 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -112,3 +112,4 @@ obj-$(CONFIG_CMD_NV)		+= nv.o
>  obj-$(CONFIG_CMD_DEFAULTENV)	+= defaultenv.o
>  obj-$(CONFIG_CMD_STATE)		+= state.o
>  obj-$(CONFIG_CMD_DHCP)		+= dhcp.o
> +obj-$(CONFIG_CMD_DECODE)	+= decode.o
> diff --git a/commands/decode.c b/commands/decode.c
> new file mode 100644
> index 0000000..80da80c
> --- /dev/null
> +++ b/commands/decode.c
> @@ -0,0 +1,65 @@
> +#include <fcntl.h>
> +#include <common.h>
> +#include <getopt.h>
> +#include <command.h>
> +#include <envfs.h>
> +#include <errno.h>
> +#include <fs.h>
> +#include <libfile.h>
> +#include <malloc.h>
> +#include <globalvar.h>
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <ddr_spd.h>

Please drop unused header files.

> +
> +void dump(uint8_t *addr, int len)
> +{
> +	int i;
> +
> +	printf("\t 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f\n\n");
> +
> +	for (i = 0; i < len; i++) {
> +		if ((i % 0x10) == 0x00) {
> +			printf("%07x:", i);
> +		}
> +		printf(" %02x", addr[i]);
> +		if ((i % 0x10) == 0xf) {
> +			printf("\n");
> +		}
> +	}
> +
> +	printf("\n");
> +}

We have no need in this dump function in barebox because

  * we can use 'md' command with '-s' from barebox command line;
  * we can use memory_display from C code.

> +
> +static int do_decode(int argc, char *argv[])
> +{
> +	int fp;

Please change 'fp' -> 'fd' as Sascha already asked.

> +	uint8_t record[256];
> +
> +	if (argc != 2) {
> +		return COMMAND_ERROR_USAGE;
> +	}
> +
> +	fp = open(argv[1], O_RDONLY);
> +
> +	if (fp < 0) {
> +		printf("could not open %s: %s\n", argv[args], errno_str());

You can't continue command execution after this error.
Please return with error code status.

> +	}
> +
> +	read(fp, &record[0], 256);
> +	close(fp);
> +
> +	printf("Decoding EEPROM: %s\n\n", argv[1]);
> +
> +	prin(record);
> +	printf("\n\n");
> +
> +	return 0;
> +}
> +BAREBOX_CMD_HELP_START(decode)
> +BAREBOX_CMD_HELP_TEXT("Not enough or more than one argument to continue.")

This does not look like help message for the command.

> +BAREBOX_CMD_HELP_END
> +
> +BAREBOX_CMD_START(decode)
> +	.cmd            = do_decode,
> +BAREBOX_CMD_END
> -- 
> 2.1.4
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox


-- 
-- 
Best regards,
  Antony Pavlov

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Re: [RFC V2 3/3] add decode command (SPD EEPROM data decoder)

[Sascha Hauer]

On Wed, Jun 24, 2015 at 03:57:29PM +0300, Alexander Smirnov wrote:
> decode-dimms perl script is used as prototype
> (see https://github.com/groeck/i2c-tools/blob/master/eeprom/decode-dimms).
> 
> Here is a sample decode output:
> 
> barebox@barebox sandbox:/ decode env/crucial_pc2-6400_ddr2
> Decoding EEPROM: env/crucial_pc2-6400_ddr2
> 
> ---=== SPD EEPROM Information ===---
> EEPROM Checksum of bytes 0-62			 OK (0xCA)
> Total number of bytes in EEPROM			 256
> Fundamental Memory type				 DDR2 SDRAM
> SPD Revision					 1.3
> 
> ---=== Memory Characteristics ===---
> Maximum module speed				 800 MHz (PC2-6400)
> Size						 1024 MB
> Banks x Rows x Columns x Bits			 8 x 14 x 10 x 64
> Ranks						 1
> SDRAM Device Width				 8 bits
> Module Height					 30.0 mm
> Module Type					 SO-DIMM (67.6 mm)
> DRAM Package					 Planar
> Voltage Interface Level				 SSTL 1.8V
> Module Configuration Type 			 No Parity
> Refresh Rate					 Reduced (7.8 us) - Self Refresh
> Supported Burst Lengths				 4, 8
> Supported CAS Latencies (tCL)			 6T
> tCL-tRCD-tRP-tRAS				 6-6-6-18 as DDR2-800
> Minimum Cycle Time				 250 (ns*100) at CAS 6
> Maximum Access Time				 4 (ns*10) at CAS 6
> Maximum Cycle Time (tCK max)			 8 ns
> 
> ---=== Timing Parameters ===---
> Address/Command Setup Time Before Clock (tIS)	 17 (ns*100)
> Address/Command Hold Time After Clock (tIH)	 25 (ns*100)
> Data Input Setup Time Before Strobe (tDS)	 5 (ns*100)
> Data Input Hold Time After Strobe (tDH)		 12 (ns*100)
> Minimum Row Precharge Delay (tRP)		 150 (ns*10)
> Minimum Row Active to Row Active Delay (tRRD)	 75 (ns*10)
> Minimum RAS# to CAS# Delay (tRCD)		 150 (ns*10)
> Minimum RAS# Pulse Width (tRAS)			 450 (ns*10)
> Write Recovery Time (tWR)			 150 (ns*10)
> Minimum Write to Read CMD Delay (tWTR)		 75 (ns*10)
> Minimum Read to Pre-charge CMD Delay (tRTP)	 75 (ns*10)
> Minimum Active to Auto-refresh Delay (tRC)	 600 (ns*10)
> Minimum Recovery Delay (tRFC)			 1270 (ns*10)
> Maximum DQS to DQ Skew (tDQSQ)			 20 (ns*100)
> Maximum Read Data Hold Skew (tQHS)		 30 (ns*100)
> 
> ---=== Manufacturing Information ===---
> Manufacturer JEDEC ID				 7f 7f 7f 7f 7f 9b 00 00
> Part Number					 CT12864AC800.M8FM8
> Manufacturing Date				 2014-W24
> Assembly Serial Number				 0x00000000
> 
> TODOs:
> 
>   * Timing Parameters section output format is slightly
>     differ from decode-dimms' format;
>   * supports only DDR2 SPD EEPROM.
> 
> Signed-off-by: Alexander Smirnov <alllecs@yandex.ru>
> ---
>  commands/Kconfig  |  7 ++++++
>  commands/Makefile |  1 +
>  commands/decode.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 73 insertions(+)
> 
> diff --git a/commands/Kconfig b/commands/Kconfig
> index bb6674e..9230873 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -2102,6 +2102,13 @@ config CMD_STATE
>  	depends on STATE
>  	prompt "state"
>  
> +config CMD_DECODE
> +	tristate
> +	prompt "decode"
> +	select DDR_SPD
> +	help
> +	  decode spd eeprom
> +
>  # end Miscellaneous commands
>  endmenu
>  
> diff --git a/commands/Makefile b/commands/Makefile
> index 3698347..71cd877 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -112,3 +112,4 @@ obj-$(CONFIG_CMD_NV)		+= nv.o
>  obj-$(CONFIG_CMD_DEFAULTENV)	+= defaultenv.o
>  obj-$(CONFIG_CMD_STATE)		+= state.o
>  obj-$(CONFIG_CMD_DHCP)		+= dhcp.o
> +obj-$(CONFIG_CMD_DECODE)	+= decode.o
> diff --git a/commands/decode.c b/commands/decode.c
> new file mode 100644
> index 0000000..80da80c
> --- /dev/null
> +++ b/commands/decode.c
> @@ -0,0 +1,65 @@
> +#include <fcntl.h>
> +#include <common.h>
> +#include <getopt.h>
> +#include <command.h>
> +#include <envfs.h>
> +#include <errno.h>
> +#include <fs.h>
> +#include <libfile.h>
> +#include <malloc.h>
> +#include <globalvar.h>
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <ddr_spd.h>
> +
> +void dump(uint8_t *addr, int len)
> +{
> +	int i;
> +
> +	printf("\t 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f\n\n");
> +
> +	for (i = 0; i < len; i++) {
> +		if ((i % 0x10) == 0x00) {
> +			printf("%07x:", i);
> +		}
> +		printf(" %02x", addr[i]);
> +		if ((i % 0x10) == 0xf) {
> +			printf("\n");
> +		}
> +	}
> +
> +	printf("\n");
> +}
> +
> +static int do_decode(int argc, char *argv[])
> +{
> +	int fp;
> +	uint8_t record[256];
> +
> +	if (argc != 2) {
> +		return COMMAND_ERROR_USAGE;
> +	}
> +
> +	fp = open(argv[1], O_RDONLY);
> +
> +	if (fp < 0) {
> +		printf("could not open %s: %s\n", argv[args], errno_str());
> +	}
> +
> +	read(fp, &record[0], 256);
> +	close(fp);

read_file_2 is your friend here. It reads a file into an allocated
buffer.

Sascha


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