Barebox working on freescale-mx25-3-stack?

Barebox working on freescale-mx25-3-stack?

[Matthias Kaehlcke]

hi,

i'm trying to run barebox on a Freescale i.MX25 3-Stack board. for
this purpose i built barebox with the freescale-mx25-3-stack
defconfig, using the toolchain provided by the Freescale BSP (i also
tried it with a custom one). i then dumped the barebox.bin on a MMC
card, plugged the card into the socket of the board and switched the
board on, but nothing happened :(

booting u-boot or redboot from MMC succeeds, so the settings of SW21
and SW22 shouldn't be the problem

is barebox supposed to work on this board or is the port still in
preliminary state?

best regards

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

            Nothing is more despicable than respect based on fear
                              (Albert Camus)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: Barebox working on freescale-mx25-3-stack?

[Eric Bénard]

Hi Matthias,

Le 23/03/2010 14:32, Matthias Kaehlcke a écrit :
> i'm trying to run barebox on a Freescale i.MX25 3-Stack board. for
> this purpose i built barebox with the freescale-mx25-3-stack
> defconfig, using the toolchain provided by the Freescale BSP (i also
> tried it with a custom one). i then dumped the barebox.bin on a MMC
> card, plugged the card into the socket of the board and switched the
> board on, but nothing happened :(
>
> booting u-boot or redboot from MMC succeeds, so the settings of SW21
> and SW22 shouldn't be the problem
>
> is barebox supposed to work on this board or is the port still in
> preliminary state?
>
you can check the patch I sent last friday, it works fine on our i.MX25 
board for NAND boot (MMC boot not tested yet).
I'll post an updated version of the patch in a few days as per Sascha's 
comments + a few tuning in the env.

Eric

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Re: Barebox working on freescale-mx25-3-stack?

[Sascha Hauer]

Hi Matthias,

On Tue, Mar 23, 2010 at 02:32:17PM +0100, Matthias Kaehlcke wrote:
> hi,
> 
> i'm trying to run barebox on a Freescale i.MX25 3-Stack board. for
> this purpose i built barebox with the freescale-mx25-3-stack
> defconfig, using the toolchain provided by the Freescale BSP (i also
> tried it with a custom one). i then dumped the barebox.bin on a MMC
> card, plugged the card into the socket of the board and switched the
> board on, but nothing happened :(

I just checked, it works, but not with the current defconfig. Please
enable CONFIG_ARCH_IMX_INTERNAL_BOOT to boot from MMC. Note that
currently the CPLD is not initialised in barebox and so the FEC is not
working (It is working if barebox runs as a second stage loader after
Freescales redboot).

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
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Re: Barebox working on freescale-mx25-3-stack?

[Matthias Kaehlcke]

hi sascha,

El Tue, Mar 23, 2010 at 03:26:43PM +0100 Sascha Hauer ha dit:

> On Tue, Mar 23, 2010 at 02:32:17PM +0100, Matthias Kaehlcke wrote:
> > hi,
> > 
> > i'm trying to run barebox on a Freescale i.MX25 3-Stack board. for
> > this purpose i built barebox with the freescale-mx25-3-stack
> > defconfig, using the toolchain provided by the Freescale BSP (i also
> > tried it with a custom one). i then dumped the barebox.bin on a MMC
> > card, plugged the card into the socket of the board and switched the
> > board on, but nothing happened :(
> 
> I just checked, it works, but not with the current defconfig. Please
> enable CONFIG_ARCH_IMX_INTERNAL_BOOT to boot from MMC. Note that
> currently the CPLD is not initialised in barebox and so the FEC is not
> working (It is working if barebox runs as a second stage loader after
> Freescales redboot).

thanks for checking and for your reply

i enabled CONFIG_ARCH_IMX_INTERNAL_BOOT, but it doesn't work either. i
also tried to start barebox from NAND, but no way :(

the barebox version is v2010.03.0, i forgot to mention that in my
initial post

if you can send me the barebox image that works on your board i'll
check if it works on mine, and we'll have some more certainty about
whether there is some obscure problem in my build process or my board
is somehow different to yours

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

          Dreams and reality are opposites. Action synthesizes them
                             (Assata Shakur)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: Barebox working on freescale-mx25-3-stack?

[Eric Bénard]

Hi Matthias,

Le 23/03/2010 16:09, Matthias Kaehlcke a écrit :
> if you can send me the barebox image that works on your board i'll
> check if it works on mine, and we'll have some more certainty about
> whether there is some obscure problem in my build process or my board
> is somehow different to yours
>
one possible diff : do you have DDR2 or Mobile DDR on your board ?

Eric

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Re: Barebox working on freescale-mx25-3-stack?

[Sascha Hauer]

On Tue, Mar 23, 2010 at 04:09:15PM +0100, Matthias Kaehlcke wrote:
> hi sascha,
> 
> El Tue, Mar 23, 2010 at 03:26:43PM +0100 Sascha Hauer ha dit:
> 
> > On Tue, Mar 23, 2010 at 02:32:17PM +0100, Matthias Kaehlcke wrote:
> > > hi,
> > > 
> > > i'm trying to run barebox on a Freescale i.MX25 3-Stack board. for
> > > this purpose i built barebox with the freescale-mx25-3-stack
> > > defconfig, using the toolchain provided by the Freescale BSP (i also
> > > tried it with a custom one). i then dumped the barebox.bin on a MMC
> > > card, plugged the card into the socket of the board and switched the
> > > board on, but nothing happened :(
> > 
> > I just checked, it works, but not with the current defconfig. Please
> > enable CONFIG_ARCH_IMX_INTERNAL_BOOT to boot from MMC. Note that
> > currently the CPLD is not initialised in barebox and so the FEC is not
> > working (It is working if barebox runs as a second stage loader after
> > Freescales redboot).
> 
> thanks for checking and for your reply
> 
> i enabled CONFIG_ARCH_IMX_INTERNAL_BOOT, but it doesn't work either. i
> also tried to start barebox from NAND, but no way :(
> 
> the barebox version is v2010.03.0, i forgot to mention that in my
> initial post
> 
> if you can send me the barebox image that works on your board i'll
> check if it works on mine, and we'll have some more certainty about
> whether there is some obscure problem in my build process or my board
> is somehow different to yours

I sent the image to you in private. Here are my dip switch settings, I
don't know which of them are important:

On the baseboard:
sw22: 00000000
sw21: 11000000

On the Debug board:

sw5 .. SW10: 0

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
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Re: Barebox working on freescale-mx25-3-stack?

[Matthias Kaehlcke]

El Tue, Mar 23, 2010 at 04:31:48PM +0100 Sascha Hauer ha dit:

> On Tue, Mar 23, 2010 at 04:09:15PM +0100, Matthias Kaehlcke wrote:

> > i enabled CONFIG_ARCH_IMX_INTERNAL_BOOT, but it doesn't work either. i
> > also tried to start barebox from NAND, but no way :(
> > 
> > the barebox version is v2010.03.0, i forgot to mention that in my
> > initial post
> > 
> > if you can send me the barebox image that works on your board i'll
> > check if it works on mine, and we'll have some more certainty about
> > whether there is some obscure problem in my build process or my board
> > is somehow different to yours
> 
> I sent the image to you in private. Here are my dip switch settings, I
> don't know which of them are important:
> 
> On the baseboard:
> sw22: 00000000
> sw21: 11000000
> 
> On the Debug board:
> 
> sw5 .. SW10: 0

thanks for the image and your dip switch settings (mine are the same)

i flashed the image (first at MMC then at NAND), the board still
doesn't come up :(

i'm running out of ideas at this point. there must be some difference
in our hardware, as it clearly works on your board but not on mine

for the moment i'll stick with u-boot ...

thanks for your help

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

  Si deseas mantener tu libertad, debes estar preparado para defenderla
                          (Richard Stallman)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: Barebox working on freescale-mx25-3-stack?

[Matthias Kaehlcke]

Hi Eric,

El Tue, Mar 23, 2010 at 04:31:11PM +0100 Eric Bénard ha dit:

> Le 23/03/2010 16:09, Matthias Kaehlcke a écrit :
> >if you can send me the barebox image that works on your board i'll
> >check if it works on mine, and we'll have some more certainty about
> >whether there is some obscure problem in my build process or my board
> >is somehow different to yours
> >
> one possible diff : do you have DDR2 or Mobile DDR on your board ?

according to the board documentation it's DDR2

is this what barebox expects to find?

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

      Debugging is like alien abduction. Large blocks of time disappear,
                    for which you have no explanation
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: Barebox working on freescale-mx25-3-stack?

[Eric Bénard]

Hi Matthias,

Le 23/03/2010 17:22, Matthias Kaehlcke a écrit :
> El Tue, Mar 23, 2010 at 04:31:11PM +0100 Eric Bénard ha dit:
>
>> Le 23/03/2010 16:09, Matthias Kaehlcke a écrit :
>>> if you can send me the barebox image that works on your board i'll
>>> check if it works on mine, and we'll have some more certainty about
>>> whether there is some obscure problem in my build process or my board
>>> is somehow different to yours
>>>
>> one possible diff : do you have DDR2 or Mobile DDR on your board ?
>
> according to the board documentation it's DDR2
>
> is this what barebox expects to find?
>
for the 3stack yes (but I think there may be some 3stack with mDDR as 
both init sequence are in redboot for example).
If you try my patch, it's for mDDR.

Eric

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Re: Barebox working on freescale-mx25-3-stack?

[Ivo Clarysse]

On Tue, Mar 23, 2010 at 5:22 PM, Matthias Kaehlcke
<matthias@kaehlcke.net> wrote:
> according to the board documentation it's DDR2
>
> is this what barebox expects to find?
>

I have an IMX25PDK with DDR2 memory (Samsung K4T51163QE-ZCE6).

To boot barebox from an SD card, I had to apply the following patch to
the current HEAD (ce2411432e23b5cc313c92278b2320bf1547c002):


diff --git a/board/freescale-mx25-3-stack/3stack.c
b/board/freescale-mx25-3-stack/3stack.c
index 5590e55..d1f0fdc 100644
--- a/board/freescale-mx25-3-stack/3stack.c
+++ b/board/freescale-mx25-3-stack/3stack.c
@@ -48,17 +48,25 @@ struct imx_dcd_entry __dcd_entry_0x400 dcd_entry[] = {
 	{ .ptr_type = 4, .addr = 0xb8002050, .val = 0x0000d843, },
 	{ .ptr_type = 4, .addr = 0xb8002054, .val = 0x22252521, },
 	{ .ptr_type = 4, .addr = 0xb8002058, .val = 0x22220a00, },
-	{ .ptr_type = 4, .addr = 0xb8001010, .val = 0x00000004, },
-	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0x92100000, },
-	{ .ptr_type = 1, .addr = 0x80000400, .val = 0x21, },
-	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0xa2100000, },
-	{ .ptr_type = 4, .addr = 0x80000000, .val = 0x12344321, },
-	{ .ptr_type = 4, .addr = 0x80000000, .val = 0x12344321, },
-	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0xb2100000, },
-	{ .ptr_type = 1, .addr = 0x80000033, .val = 0xda, },
-	{ .ptr_type = 1, .addr = 0x81000000, .val = 0xff, },
-	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0x82216880, },
-	{ .ptr_type = 4, .addr = 0xb8001004, .val = 0x00295729, },
+	{ .ptr_type = 4, .addr = 0xb8001004, .val = 0x0076e83a, },
+	{ .ptr_type = 4, .addr = 0xb8001010, .val = 0x00000304, },
+	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0x92210000, },
+	{ .ptr_type = 4, .addr = 0x80000f00, .val = 0x12344321, },
+	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0xb2210000, },
+	{ .ptr_type = 1, .addr = 0x82000000, .val = 0xda, },
+	{ .ptr_type = 1, .addr = 0x83000000, .val = 0xda, },
+	{ .ptr_type = 1, .addr = 0x81000400, .val = 0xda, },
+	{ .ptr_type = 1, .addr = 0x80000333, .val = 0xda, },
+	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0x92210000, },
+	{ .ptr_type = 4, .addr = 0x80000400, .val = 0x12344321, },
+	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0xa2210000, },
+	{ .ptr_type = 4, .addr = 0x80000000, .val = 0x87654321, },
+	{ .ptr_type = 4, .addr = 0x80000000, .val = 0x87654321, },
+	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0xb2210000, },
+	{ .ptr_type = 1, .addr = 0x80000233, .val = 0xda, },
+	{ .ptr_type = 1, .addr = 0x81000780, .val = 0xda, },
+	{ .ptr_type = 1, .addr = 0x81000400, .val = 0xda, },
+	{ .ptr_type = 4, .addr = 0xb8001000, .val = 0x82216080, },
 	{ .ptr_type = 4, .addr = 0x53f80008, .val = 0x20034000, },
 };

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Re: Barebox working on freescale-mx25-3-stack?

[Matthias Kaehlcke]

Hi Ivo,

El Wed, Mar 24, 2010 at 03:54:21PM +0100 Ivo Clarysse ha dit:

> On Tue, Mar 23, 2010 at 5:22 PM, Matthias Kaehlcke
> <matthias@kaehlcke.net> wrote:
> > according to the board documentation it's DDR2
> >
> > is this what barebox expects to find?
> >
> 
> I have an IMX25PDK with DDR2 memory (Samsung K4T51163QE-ZCE6).
> 
> To boot barebox from an SD card, I had to apply the following patch to
> the current HEAD (ce2411432e23b5cc313c92278b2320bf1547c002):

after applying your patch barebox effectivly came up :)

thanks a lot!

could you explain in few words why the patch is needed?

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

              We build too many walls and not enough bridges
                             (Isaac Newton)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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Re: Barebox working on freescale-mx25-3-stack?

[Ivo Clarysse]

On Wed, Mar 24, 2010 at 4:08 PM, Matthias Kaehlcke
<matthias@kaehlcke.net> wrote:
>
> after applying your patch barebox effectivly came up :)
>
> thanks a lot!
>
> could you explain in few words why the patch is needed?

RAM initialization is implemented in two places: lowlevel_init.S and
the "Device Configuration Data" (DCD) block.

When booting from an SD card, the i.MX25 reads out the DCD block and
applies the settings found there.

The RAM initialization in lowlevel_init.S is skipped when booting from
SD; by the time board_init_lowlevel gets executed,
that routine is already running from RAM, and will skip initializing memory.

The DCD table in barebox git contains entries for mDDR memory.  This
does not work with DDR2 memory.

Probably barebox needs a compile-time option to switch between 128 MiB
mDDR memory installed on older MCIMX25PDK CPU engine boards and the 64
MiB DDR2 memory found on newer boards.

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Re: Barebox working on freescale-mx25-3-stack?

[Matthias Kaehlcke]

hi ivo,

El Wed, Mar 24, 2010 at 04:23:33PM +0100 Ivo Clarysse ha dit:

> On Wed, Mar 24, 2010 at 4:08 PM, Matthias Kaehlcke
> <matthias@kaehlcke.net> wrote:
> >
> > after applying your patch barebox effectivly came up :)
> >
> > thanks a lot!
> >
> > could you explain in few words why the patch is needed?
> 
> RAM initialization is implemented in two places: lowlevel_init.S and
> the "Device Configuration Data" (DCD) block.
> 
> When booting from an SD card, the i.MX25 reads out the DCD block and
> applies the settings found there.
> 
> The RAM initialization in lowlevel_init.S is skipped when booting from
> SD; by the time board_init_lowlevel gets executed,
> that routine is already running from RAM, and will skip initializing memory.
> 
> The DCD table in barebox git contains entries for mDDR memory.  This
> does not work with DDR2 memory.
> 
> Probably barebox needs a compile-time option to switch between 128 MiB
> mDDR memory installed on older MCIMX25PDK CPU engine boards and the 64
> MiB DDR2 memory found on newer boards.

thanks a lot for your explication!

i wasn't aware that differently equipped CPU engine boards exists,
good to know

best regards

-- 
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

    Me lo contaron y lo olvidé, lo vi y lo entendí, lo hice y lo aprendí
                              (Confucio)
                                                                 .''`.
    using free software / Debian GNU/Linux | http://debian.org  : :'  :
                                                                `. `'`
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