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From: Baruch Siach <baruch@tkos.co.il>
To: barebox@lists.infradead.org
Cc: Baruch Siach <baruch@tkos.co.il>
Subject: [PATCH 8/8] mx25 3ds: add support for boot from UART
Date: Wed,  9 Jun 2010 10:05:07 +0300	[thread overview]
Message-ID: <f9f84cc251848d133fae379e6d20253df2121ffb.1276065824.git.baruch@tkos.co.il> (raw)
In-Reply-To: <cover.1276065824.git.baruch@tkos.co.il>

For details of the UART protocol see the i.MX25 Reference Manual, section 7.8
"Serial Download protocol".

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
 arch/arm/mach-imx/Kconfig                    |    5 +++++
 board/freescale-mx25-3-stack/3stack.c        |    4 ++++
 board/freescale-mx25-3-stack/lowlevel_init.S |    5 +++++
 3 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 419daab..40cebed 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -319,6 +319,11 @@ config FREESCALE_MX25_3STACK_SDRAM_64MB_DDR2
 config FREESCALE_MX25_3STACK_SDRAM_128MB_MDDR
 	bool "128 MB (mDDR)"
 endchoice
+
+config FREESCALE_MX25_3STACK_UART_BOOT
+	bool "Boot from UART"
+	depends on ARCH_IMX_INTERNAL_BOOT
+
 endif
 endmenu
 
diff --git a/board/freescale-mx25-3-stack/3stack.c b/board/freescale-mx25-3-stack/3stack.c
index a657a47..081487a 100644
--- a/board/freescale-mx25-3-stack/3stack.c
+++ b/board/freescale-mx25-3-stack/3stack.c
@@ -44,7 +44,11 @@ extern unsigned long _stext;
 
 void __naked __flash_header_start go(void)
 {
+#if defined CONFIG_FREESCALE_MX25_3STACK_UART_BOOT
+	__asm__ (".word	exception_vectors\n");
+#else
 	__asm__ __volatile__("b exception_vectors\n");
+#endif
 }
 
 struct imx_dcd_entry __dcd_entry_0x400 dcd_entry[] = {
diff --git a/board/freescale-mx25-3-stack/lowlevel_init.S b/board/freescale-mx25-3-stack/lowlevel_init.S
index 73bb147..b65a070 100644
--- a/board/freescale-mx25-3-stack/lowlevel_init.S
+++ b/board/freescale-mx25-3-stack/lowlevel_init.S
@@ -73,6 +73,11 @@ board_init_lowlevel:
 	writel(0x000FDFFF, IMX_CCM_BASE + CCM_CGCR2)
 	writel(0x0000FEFF, IMX_CCM_BASE + MX25_CCM_MCR)
 
+#if defined CONFIG_FREESCALE_MX25_3STACK_UART_BOOT
+	/* initialize CCM_CCTL, ARM clk = 400, AHB clk = 133 */
+	writel(0x20034000, IMX_CCM_BASE + 0x8);
+#endif
+
 	/* Skip SDRAM initialization if we run from RAM */
 	cmp	pc, #0x80000000
 	bls	1f
-- 
1.7.1


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  parent reply	other threads:[~2010-06-09  7:05 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-09  7:04 [PATCH 0/8] i.MX25 3DS fixes and enhancements Baruch Siach
2010-06-09  7:05 ` [PATCH 1/8] mx25 3ds: fix build failure Baruch Siach
2010-06-09  7:05 ` [PATCH 2/8] mx25: fix typo in imx25-regs.h Baruch Siach
2010-06-09  7:05 ` [PATCH 3/8] mx25 3ds: cleanup lowlevel_init code Baruch Siach
2010-06-09  7:05 ` [PATCH 4/8] mx25: add support for i2c Baruch Siach
2010-06-09  7:05 ` [PATCH 5/8] i2c: add driver for the MC34704 PMIC Baruch Siach
2010-06-09  7:05 ` [PATCH 6/8] mx25 3ds: add support for i2c master and PMIC Baruch Siach
2010-06-14 13:01   ` Ivo Clarysse
2010-06-14 13:39     ` Baruch Siach
2010-06-09  7:05 ` [PATCH 7/8] mx25 3ds: fix fec initialization Baruch Siach
2010-06-09  7:05 ` Baruch Siach [this message]
2010-06-10 11:12   ` [PATCH 8/8] mx25 3ds: add support for boot from UART Sascha Hauer
2010-06-10 11:49     ` Baruch Siach
2010-06-10 12:12       ` Sascha Hauer
2010-06-10 12:42         ` Baruch Siach
2010-06-10 12:46           ` Baruch Siach
2010-06-10 13:56           ` Sascha Hauer
2010-06-10 16:09             ` Baruch Siach
2010-06-10 11:10 ` [PATCH 0/8] i.MX25 3DS fixes and enhancements Sascha Hauer

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