Date: Fri, 13 Jun 2014 22:20:43 +0600 From: Stepan Dyatkovskiy <stpworld@narod.ru> To: Ian Lepore <ian@FreeBSD.org> Cc: Tim Kientzle <tim@kientzle.com>, freebsd-arm@FreeBSD.org Subject: Re: Compilation for ARM Message-ID: <539B24DB.4090005@narod.ru> In-Reply-To: <1402676121.20883.231.camel@revolution.hippie.lan> References: <53935D02.2030604@narod.ru> <6D7645D2-9C08-4B5D-BAA5-5B6EC8F66F0B@kientzle.com> <5393FF7B.4020407@narod.ru> <1402428857.20883.177.camel@revolution.hippie.lan> <5398B1A2.3010007@narod.ru> <1402591005.20883.213.camel@revolution.hippie.lan> <539A2261.4070705@narod.ru> <539A62E2.20003@narod.ru> <1402676121.20883.231.camel@revolution.hippie.lan>
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Hi Ian, Yup. I have done it with default options. That works fine. Thanks! But, currently we need to compare launch times for kernel that was compiled with cortex-a9 options and for kernel that was compiled with cortex-a15 options. The reason of doing that is some improvements in clang backend that promises faster execution for (-mcpu=cortex-a15). So we would like to check it on FreeBSD kernel, since we going to use this OS as base for our applications. -Stepan Ian Lepore wrote: > On Fri, 2014-06-13 at 08:33 +0600, Stepan Dyatkovskiy wrote: >> Hi all, >> >> Currently I'm trying to compile kernel, with activated cortex-a9 or a15 >> options (TARGET_CPUTYPE=cortex-a9). >> Currently "as" from buildworld gives me tons of "unknown instruction" >> errors. That happens, I suppose, due to its release date (2007). >> > > It makes no sense that you are getting such problems. I've never used > TARGET_CPUTYPE at all, and there's no problem compiling the kernel with > the tools in base. All you need to build the kernel is > > make buildkernel TARGET_ARCH=armv6 KERNCONF=PANDABOARD > > -- Ian > > >> So I have tried newer versions of binutils: >> 1. devel/cross-binutils from ports. I have built it with TGTARCH=armv6 >> and TGTABI=none-eabi. >> 2. Binutils from http://ftp.gnu.org/gnu/binutils/ >> >> I did it in several steps: >> 1. I have built them. >> 2. I have entered buildenv: "make TARGET_CPUTYPE=armv6 buildenv" >> 3. # which as >> 4. # cp /usr/obj/arm.armv6/usr/src/tmp/usr/bin/as >> /usr/obj/arm.armv6/usr/src/tmp/usr/bin/as.bak >> >> Below I tried several ways to replace as/ld/and-friends: >> 5. cp /usr/local/bin/armv6-none-eabi-as >> /usr/obj/arm.armv6/usr/src/tmp/usr/bin/as >> 6. I have also tried "ln -s" >> >> 7. # make KERNCONF=PANDABOARD TARGET_CPUTYPE=cortex-a9 buildkernel >> >> Whatever I did, it always ended up with >> >> /usr/src/sys/arm/arm/locore.S: Assembler messages: >> /usr/src/sys/arm/arm/locore.S:79: Error: duplicate .fnstart directive >> /usr/src/sys/arm/arm/locore.S:255: Error: .fnend directive without .fnstart >> >> So, may be, you guys know how to deal with that? >> >> Currently I have no idea :-(.. May be sleep a bit :-) >> >> Thanks! >> >> -Stepan >> >> Stepan Dyatkovskiy wrote: >>> Hi all, >>> >>> Thanks for advices! >>> >>> That's interesting. I have managed to launch kernel, using these u-boot >>> binaries: >>> http://people.freebsd.org/~gonzo/pandaboard/ >>> >>> Looks like specific MLO. But I'm not sure. >>> >>> With regular linaro u-boot, I load kernel.bin, then try start it with >>> "go", and nothing happens. With binaries of this Gonzo guy, I did the >>> same, and everything works fine :-/ Do you know who is it (I mean >>> Gonzo)? I would like to ask him, what he did in his binaries. >>> >>> Another question: >>> I would like to build FreeBSD, using latest clang. Currently I have >>> tried to build it latest svn version of FreeBSD: >>> svn://svn.freebsd.org/base/head/ >>> With command: >>> make TARGET_ARCH=armv6 buildworld TARGET_CPUTYPE=cortex-a9 >>> >>> But got next error (repeated several >>> times):/tmp/jemalloc_atomic-22cc38.s:21: Error: garbage following >>> instruction -- `dmb ish' >>> >>> So perhaps, its better to use stable version (10.0.0), but with new >>> clang. Currently, I'm going to copy clang sources from HEAD into 10.0.0 >>> sources tree. But perhaps there is better way to do it? >>> >>> Thanks! >>> >>> -Stepan >>> >>> Ian Lepore wrote: >>>> On Thu, 2014-06-12 at 01:44 +0600, Stepan Dyatkovskiy wrote: >>>>> Hi guys, >>>>> Thank you! I have built it successfully. It was really simple. Currently >>>>> I'm trying to launch with u-boot. Are here any instructions/manual how >>>>> to run kernel with u-boot? >>>>> Thanks! >>>>> -Stepan >>>> >>>> If you compile the dtb into the kernel, you can launch the kernel >>>> directly from u-boot. If you don't, then you need u-boot to launch >>>> ubldr (loader(8) that uses the u-boot API, which requires a u-boot with >>>> the API option enabled). >>>> >>>> The kernel can be loaded at any 1MB-boundary address, and can be >>>> launched by jumping to the load address + 0x100, such as: >>>> >>>> fatload <device/partition> 11000000; go 11000100 >>>> >>>> If you are using a modern u-boot that enables data caches, you need to >>>> turn them off manually, like: >>>> >>>> fatload <device/partition> 11000000 >>>> dcache off; dcache flush >>>> go 11000100 >>>> >>>> This is just a u-boot quirk, it disables caches on bootm and bootelf >>>> commands, but not on a "go" command. >>>> >>>> -- Ian >>>> >>> >> > >
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