Hi Austin, Here's the list. armv7-a is on the list. lewis@lewis-ubuntu:~/x-tools/arm-cortex_a8-linux-gnueabihf/bin$ ./arm-cortex_a8-linux-gnueabihf-gcc -E -march=help -xc /dev/null arm-cortex_a8-linux-gnueabihf-gcc: error: unrecognized -march target: help arm-cortex_a8-linux-gnueabihf-gcc: note: valid arguments are: armv2 armv2a armv3 armv3m armv4 armv4t armv5 armv5t armv5e armv5te armv5tej armv6 armv6j armv6k armv6z armv6kz armv6zk armv6t2 armv6-m armv6s-m armv7 armv7-a armv7ve armv7-r armv7-m armv7e-m armv8-a armv8.1-a armv8.2-a armv8.3-a armv8.4-a armv8-m.base armv8-m.main armv8-r iwmmxt iwmmxt2 arm-cortex_a8-linux-gnueabihf-gcc: error: missing argument to '-march=' That's strange. When compiling both barebox and linux. I always got errors like: "selected processor does not support `rev r7,r7' Kind regards, Lewis On Thu, Mar 21, 2019 at 4:40 PM Austin Morton <austinpmorton@xxxxxxxxx> wrote: > > Any recent version of gcc should spit out a list of supported March values if invoked with an invalid value. (read gcc 7 or higher). > > What does this command output on your compiler? > > # gcc -E -march=help -xc /dev/null > > https://stackoverflow.com/questions/47299458/how-can-i-determine-what-architectures-gcc-supports > > On Thu, Mar 21, 2019, 04:25 Lewis Zhou <lewisou@xxxxxxxxx> wrote: >> >> Hi, >> >> I recently tried to compile the barebox bootloaer with the >> arm-cortex_a8-linux-gnueabihf configuration which is based on the >> sample configuration arm-cortex_a8-linux-gnueabi with the hardware >> float enabled. >> >> However, the compiler (gcc) seems not support -march=armv7-a flag. I >> think something is wrong as the cortex_a8 is a sub-architecture of >> armv7-a. >> >> The toolchain failed to compile both the barebox and the linux kernel >> (4.19). Please help! Attached is a response from the barebox mailing >> list. >> >> >> Kind regards, >> Lewis >> >> ---------- Forwarded message --------- >> From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> >> Date: Thu, Mar 21, 2019 at 4:06 PM >> Subject: Re: selected processor does not support `rev r7,r7' >> To: Lewis Zhou <lewisou@xxxxxxxxx> >> Cc: <barebox@xxxxxxxxxxxxxxxxxxx> >> >> >> On Thu, Mar 21, 2019 at 03:53:06PM +0800, Lewis Zhou wrote: >> > Hi Sascha, >> > >> > Here's the log: >> > >> > make -f scripts/Makefile.build obj=common >> > >> > arm-cortex_a8-linux-gnueabihf-gcc -Wp,-MD,common/.memory.o.d >> > -nostdinc -isystem >> > /home/lewis/x-tools/arm-cortex_a8-linux-gnueabihf/lib/gcc/arm-cortex_a8-linux-gnueabihf/8.3.0/include >> > -D__KERNEL__ -D__BAREBOX__ -Iinclude >> > -I/home/lewis/OpenProj/barebox/dts/include >> > -I/home/lewis/OpenProj/barebox/arch/arm/include >> > -I/home/lewis/OpenProj/barebox/arch/arm/include -include >> > /home/lewis/OpenProj/barebox/include/linux/kconfig.h -fno-builtin >> > -ffreestanding -D__ARM__ -fno-strict-aliasing -marm -mlittle-endian >> > -mabi=aapcs-linux -mno-thumb-interwork -D__LINUX_ARM_ARCH__=7 >> > -march=armv5t -Wa,-march=armv7-a -msoft-float -mthumb >> >> -march=armv5t -Wa,-march=armv7-a shouldn't be here. It comes from this >> line in arch/arm/Makefile: >> >> arch-$(CONFIG_CPU_32v7) :=-D__LINUX_ARM_ARCH__=7 $(call >> cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) >> >> This means the build process will use "-march=armv7-a" when the compiler >> supports it. Apparently it does not, so it will fall back to >> "-march=armv5t -Wa,-march=armv7-a". armv5t doesn't support thumb2 code, >> only thumb and as it seems thumb does not support the "rev" instruction. >> >> Your compiler should really support "-march=armv7-a". If it doesn't I >> really think there is something wrong with it. >> >> Sascha >> >> -- >> Pengutronix e.K. | | >> Industrial Linux Solutions | http://www.pengutronix.de/ | >> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | >> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
