Re: Can I overwrite hardware settings in OALStartup.s?

Thanks Elias for your reply.
But I am still confused by the calling sequence.
I think the entry point after hardware reset is
C:\WINCE600\PLATFORM\COMMON\SRC\SOC\PXA27X_MS_V1\OAL\STARTUP\startup.s
Then "bl xlli_GPIO_init" is called to initialize GPIOs.
Then "b OALStartup" is called to jump to
C:\WINCE600\PLATFORM\MyPlatform\SRC\Bootloader\startup.s and never return
back.
Inside "OALStartup " the first function called is "bl Init_HexLeds". And
comments before that function call says that the GPIOs are already
initialized.
That's why I think I can overwrite GPIO settings using my own and I can
build bootloader using "build -c" command.
If I make changes in
C:\WINCE600\PLATFORM\COMMON\SRC\SOC\PXA27X_MS_V1\OAL\STARTUP\startup.s, I
need to build the OS to make my changes inclueded in the bootloader, right?

Please clairfy and thanks again,
James



"James" <James.li@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:OKyqzINnHHA.960@xxxxxxxxxxxxxxxxxxxxxxx
Hi,

I want to build my own bootloader using PB6 for PXA255.
I created a new platform selecting BSP MainstoneIII. Then if I navigate to
c:\wince600\platform\MyPlatform\src\Bootloader using command prompt and
enter "build -c". I can see the eboot.bin and eboot.nb0 in the release
folder.
My questions are:
1. Is
C:\WINCE600\PLATFORM\COMMON\SRC\SOC\PXA27X_MS_V1\OAL\STARTUP\startup.s
the real entry point for bootloader?
2. Is the init_gpio setup in

C:\WINCE600\PLATFORM\COMMON\SRC\SOC\PXA27X_MS_V1\XLLP\SOURCE\xlli_lowlev_ini
t.s?
3. Can I overwrite hardware settings in OALStartup.s?

I found something strange for me and hope your guys can help me out.

Our hardware uses GPIO0 to control on-board led.
1. I built bootloader without any changes and downloaded eboot.nb0 to the
board. After I power on the board, the led is on even if I found settings
in
xlli_mainstone_defs.in and xlli_bulverde_defs.inc showing that GPIO0 is
input. The led on board should be on only when GPIO0 is output and that pi
n
is logic 1.
2. I reset GPIO settings in OALStartup before "bl Init_HexLeds" and
tried
to turn off the led, but failed.

Can anyone tell me what I did wrong?
Thanks a lot,
James




.

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