How to build linux for my own board?

["lin liu" <pursuitgospel@xxxxxxxxx>]

DA:

I am studying porting Linux to a self-designed board by following
documents in kernel pachage 2.6.25 and other information on internet.
Here are my first steps. I am starting at the point of setting up a
completely same board at91rm9200ek with a new name "mytest".

1. Setup a testing board type mytest in arch/arm/tools/mach-types.

2. Copy an existing *_defconfig (I chose at91rm9200ek_defconfig)in
arch/arm/tools/configs/ to arch/arm/tools/configs/mytest_defconfig,
remove CONFIG_MACH_AT91RM9200EK, add "CONFIG_ARCH_MYTEST=y".

3. Add ARCH_MYTEST to all entries have "depend on
CONFIG_MACH_AT91RM9200EK" in Kconfig files; Add CONFIG_MYTEST to all
condition blocks that test ARCH_AT91 in Kconfig files.

4. Copy include/asm-arm/mach-at91 to include/asm-arm/mach-mytest

5. Copy arch/arm/mach-at91 to arch/arm/mach-mytest and replace
CONFIG_MACH_AT91RM9200EK with CONFIG_ARCH_MYTEST in
arch/arm/mach-mytest/Makefile

6. Run "make ARCH=arm CROSS_COMPILE=arm-linux- mytest_defconfig", then
I get a .config file that is completely the same asthat of "make
ARCH=arm CROSS_COMPILE=arm-linux- at91r9200ek_defconfig" except a few
lines as below (I disabled CONFIG_USB_OHCI_HCD because I had problem
in compiling it with message "#error "missing bus glue for ohci-hcd").

FYI, ".config.lin" the the new config file for my board, while
".config.at91" is that of at91rm9200ek.
[linux-2.6.25]# diff .config.lin .config.at91
4c4
< # Fri Nov 28 15:18:11 2008
---
> # Fri Nov 28 14:17:54 2008
132,133c132,133
< # CONFIG_ARCH_AT91 is not set
< CONFIG_ARCH_MYTEST01=y
---
> CONFIG_ARCH_AT91=y
> # CONFIG_ARCH_LINTST01 is not set
838c838,841
< # CONFIG_USB_OHCI_HCD is not set
---
> CONFIG_USB_OHCI_HCD=y
> # CONFIG_USB_OHCI_BIG_ENDIAN_DESC is not set
> # CONFIG_USB_OHCI_BIG_ENDIAN_MMIO is not set
> CONFIG_USB_OHCI_LITTLE_ENDIAN=y

7. Make zImage with this new config, everything goes well until ld .tmp_vmlinux.

CHK include/linux/compile.h
UPD include/linux/compile.h
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1 arm-linux-ld: no machine record definedarm-linux-ld:
no machine record defined make: *** [.tmp_vmlinux1] Error 1

Could anybody tell me where the problem is? How should I build it for
a new machine type? Your comments are highly appreciated.

BTW, building it for at91rm9200ek works w/o error.

Thanks.
Best Regards.
-Lin

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