Hi Angelo,
> Does anyone boots on mpc5200 board, the linux kernel 2.6.26 (or .24 .25) using
> ARCH=powerpc?
Sure, many people do this successfully.
> Looking on web i known that it's very different from ppc mode and the right
> procedure to follow is:
>
> 1 - make lite5200b_defconfig ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu-
Note that this changes to "make 52xx/lite5200b_defconfig ..." in recent kernels.
> 2 - make cuImage.lite5200b ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu-
Well, this is debatable. Here you explicitely request a backward
compatability wrapped uImage (for firmwares being FDT ignorant):
> The output of second command is:
> ...
> CHK include/linux/version.h
> CHK include/linux/utsrelease.h
> CALL scripts/checksyscalls.sh
> CHK include/linux/compile.h
> CALL arch/powerpc/kernel/systbl_chk.sh
> CALL arch/powerpc/kernel/prom_init_check.sh
> arch/powerpc/boot/dtc -O dtb -o arch/powerpc/boot/lite5200b.dtb -b 0 /home/
> asimmini/Scrivania/linux-2.6.26.3/arch/powerpc/boot/dts/lite5200b.dts
> DTC: dts->dtb on file "/home/asimmini/Scrivania/linux-2.6.26.3/arch/powerpc/
> boot/dts/lite5200b.dts"
> WRAP arch/powerpc/boot/cuImage.lite5200b
^---- Here the wrapper gets added.
> Image Name: Linux-2.6.26.3
> Created: Wed Sep 3 15:56:16 2008
> Image Type: PowerPC Linux Kernel Image (gzip compressed)
> Data Size: 1597696 Bytes = 1560.25 kB = 1.52 MB
> Load Address: 0x00400000
> Entry Point: 0x00400550
> rm arch/powerpc/boot/lite5200b.dtb
>
> But, at this point, if i crosscompile in ppc mode i had to modify the Load
> Address wiht the mkimage tool because the SDRAM at the Bootloader time starts
> from 0xF8000000, while the uImage has a Load Address and Entry Point at
> 0x00000000.
Well still in newer kernels, uImage has load and entry address 0. Its
only the cuImage.lite5200b (and I presume other wrapped kernels) that
have this load address.
> What should i do in powerpc mode??
I suggest that you use a recent U-Boot on your board which can
explicitely pass a .dtb to the kernel and use a plain uImage + flat
device tree blob. I gather this is the best tested combination. I
myself saw problems with the wrapped image that went away when passing
the device tree explicitely.
So in 2.6.26 I'd advise you to do a "make uImage" + "make lite5200b.dtb"
and use the results in a recent U-Boot.
Cheers
Detlev
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