On Sun, Aug 21, 2011 at 7:54 PM, Nicolas Pitre <nicolas.pi...@linaro.org> wrote: > On Sun, 21 Aug 2011, John Rigby wrote: > >> I'm having trouble building the Thumb2 kernel on, I actually believe >> this same code worked some time ago before a toolchain update. There >> are actually two problems described below. I get past the first with >> a config change but don't know how to fix the second one. >> > [...] >> AS arch/arm/boot/compressed/head.o >> arch/arm/boot/compressed/head.S: Assembler messages: >> arch/arm/boot/compressed/head.S:127: Error: selected processor does >> not support requested special purpose register -- `mrs r2,cpsr' >> arch/arm/boot/compressed/head.S:134: Error: selected processor does >> not support requested special purpose register -- `mrs r2,cpsr' >> arch/arm/boot/compressed/head.S:136: Error: selected processor does >> not support requested special purpose register -- `msr cpsr_c,r2' >> make[2]: *** [arch/arm/boot/compressed/head.o] Error 1 >> make[1]: *** [arch/arm/boot/compressed/vmlinux] Error 2 >> make: *** [uImage] Error 2 >> >> Here is my gcc version: >> >> $ arm-linux-gnueabi-gcc --version >> arm-linux-gnueabi-gcc (Ubuntu/Linaro 4.6.1-5ubuntu2~ppa1) 4.6.1 >> Copyright (C) 2011 Free Software Foundation, Inc. >> This is free software; see the source for copying conditions. There is NO >> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. >> >> And as version: >> GNU assembler (GNU Binutils for Ubuntu) 2.21.52.20110707 >> Copyright 2011 Free Software Foundation, Inc. >> This program is free software; you may redistribute it under the terms of >> the GNU General Public License version 3 or later. >> This program has absolutely no warranty. >> This assembler was configured for a target of `arm-linux-gnueabi'. > > Looks to me like your assembler is broken, or gcc is not properly > telling it about the actual architecture in use. > > To confirm, please try this: > > echo -e ".arch armv7-a\n.thumb\nmrs r2, cpsr" | \ > arm-linux-gnueabi-as - -o /dev/null > > If that works then your assembler is fine. In that case the following > should fail: > > echo -e ".thumb\nmrs r2, cpsr" | \ > arm-linux-gnueabi-gcc -march=armv7-a -x assembler -o /dev/null -c - > > If for some reasons this works too, then the kernel build might be > wrong. In that case, see the output of: > > make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- V=1 \ > arch/arm/boot/compressed/head.o > > I have: > arm-linux-gnueabi-gcc (Ubuntu/Linaro 4.5.2-8ubuntu3) 4.5.2 > GNU assembler (GNU Binutils for Ubuntu) 2.21.0.20110327 > And that works for me just fine. > > Thanks for the info, just before reading your response I found this problem in GNU assembler when you say -march=all:
http://sourceware.org/bugzilla/show_bug.cgi?id=12698 I have a workaround now by setting in -march=armv7-a in arch/arm/boot/compressed/Makefile instead of -march=all. Meanwhile Ricardo is working on a fix to binutils in a ppa. --john _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
