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Re: Cross compile kernel w/ buildroot toolchain

To: Kurt Schwemmer <>
Subject: Re: Cross compile kernel w/ buildroot toolchain
From: David Daney <>
Date: Mon, 13 Mar 2006 13:16:31 -0800
Cc: Ralf Baechle <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <>
User-agent: Mozilla Thunderbird 1.0.7-1.1.fc3 (X11/20050929)
Kurt Schwemmer wrote:
I didn't touch any of the source yet.
I'm downloading the 1/10/05 2.6.15 tarball (
)now to see if that fixes things.

In response to Thiemo's message the error with (V=1) is:

make -f scripts/ obj=arch/mips/kernel
-Wp,-MD,arch/mips/kernel/.entry.o.d  -nostdinc -isystem
linux-uclibc/3.4.5/include -D__KERNEL__ -Iinclude  -D__ASSEMBLY__  -I
/usr/local/src/linux-2.6/include/asm/gcc -G 0 -mno-abicalls -fno-pic
-pipe  -finline-limit=100000 -mabi=32 -march=mips32r2 -Wa,-32
-Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
-Iinclude/asm-mips/mach-mips -Iinclude/asm-mips/mach-generic -Wall
-Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common
-ffreestanding -O2     -fomit-frame-pointer  -I
/usr/local/src/linux-2.6/include/asm/gcc -G 0 -mno-abicalls -fno-pic
-pipe  -finline-limit=100000 -mabi=32 -march=mips32r2 -Wa,-32
-Wa,-march=mips32r2 -Wa,-mips32r2 -Wa,--trap
-Iinclude/asm-mips/mach-mips -Iinclude/asm-mips/mach-generic    -c -o
arch/mips/kernel/entry.o arch/mips/kernel/entry.S
arch/mips/kernel/entry.S: Assembler messages:
arch/mips/kernel/entry.S:157: Error: opcode not supported on this
processor: mips32 (mips32) `jr.hb $31'
make[1]: *** [arch/mips/kernel/entry.o] Error 1
make: *** [arch/mips/kernel] Error 2

Also, assembler -v output:
GNU assembler version 2.16.1 (mipsel-linux-uclibc) using BFD version

Kurt Schwemmer

You could try using crosstool to generate the compiler instead of buildroot.

Also try passing -v to gcc, that will cause it to show the exact options that it is passing to gas. Perhaps that would shed some light on things.

David Daney

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