AW: [U-Boot-Users] MIPS, little endian, supported cross tool vers ions?

[Jörg Albert]

Hi Wolfgang,

you wrote:
> > mipsel-uclibc-gcc: unrecognized option `-EL'
> 
> It seems obvious that your tools and or compiler options  are  broken
> and/or misconfigured.
> 
> Where is this "-mips2 -EL" stuff coming from? You don't find this  in
> U-Boot.

Sorry for skipping the first steps. I changed the prefix "mips_4KC-" into
"mipsel-uclibc-" (./Makefile) leading to:

mipsel-uclibc-gcc -g  -Os   -D__KERNEL__ -DTEXT_BASE=0xB0000000
-I/opt/work/fw/b
ootloader/u-boot-1.0.0.purple/include -fno-builtin -ffreestanding -nostdinc
-isy
stem /opt/toolchains/toolchain_mipsel/lib/gcc-lib/mipsel-linux/3.3.1/include
-pi
pe  -DCONFIG_MIPS -D__MIPS__ -mcpu=4kc -EB -mabicalls -Wall
-Wstrict-prototypes 
-c -o stubs.o stubs.c
cc1: error: invalid option `cpu=4kc'

Afterwards I changed "-mcpu=4kc" into "-mips2" in cpu/mips/config.mk. "-EL"
to replace
"-EB" as I want a little-endian boot loader, but "-EL" is default anyway and
ignored.

> Obviously this is a tool problem first. I guess you will need to  fix
> this  anyway,  or  you will run into the same problems later when you
> want to compile your OS kernel and/or applications.

Doubt this, as I've already compiled a running 2.4.22 kernel.
I've replaced "-mcpu=4kc" by "-march=4kc" (a better match I guess),
applied Masami's patch of the linker control files and got:

mipsel-uclibc-gcc -Wa,-gstabs -D__ASSEMBLY__ -g  -Os   -D__KERNEL__
-DTEXT_BASE=0xB0000000 -I/opt/work/fw/bootloader/u-boot-1.0.0.work/include
-fno-builtin -ffreestanding -nostdinc -isystem
/opt/toolchains/toolchain_mipsel/lib/gcc-lib/mipsel-linux/3.3.1/include
-pipe  -DCONFIG_MIPS -D__MIPS__ -march=4kc -mabicalls -c -o start.o
/opt/work/fw/bootloader/u-boot-1.0.0.work/cpu/mips/start.S
/opt/work/fw/bootloader/u-boot-1.0.0.work/cpu/mips/start.S: Assembler
messages:
/opt/work/fw/bootloader/u-boot-1.0.0.work/cpu/mips/start.S:242: Error:
Cannot branch to undefined symbol.
/opt/work/fw/bootloader/u-boot-1.0.0.work/cpu/mips/start.S:247: Error:
Cannot branch to undefined symbol.
/opt/work/fw/bootloader/u-boot-1.0.0.work/cpu/mips/start.S:259: Error:
Cannot branch to undefined symbol. 

I guess gcc 3.3.1 doesn't like the option "-mcpu=" nor branch-and-link to
undefined symbols anymore. AFAIK the toolchain Masami recommended is verson
2.96.x

I've replaced the three branches (bal) by jumps (jal) and moved the GOT
initialization
before them which let me successfully compile the boot loader.
I'll now add the board-specific stuff (serial driver, flash, network).
 
Wonder if anyone out there has ever tried gcc 3.3.x for compiling a MIPS
U-Boot
(big or little-endian)?

/Jörg