Bare metal toolchain for A15
Singh, Ravi Kumar (Ravi)
Ravi.Singh at lsi.com
Thu Mar 8 16:58:59 UTC 2012
Can someone point me to bare metal example using GNU toolchain.
On Mar 8, 2012, at 10:51 AM, "William Mills" <wmills at ti.com> wrote:
> I need to supply a Linaro toolchain "aligned" (same source code)
> bare-metal compiler to a group doing benchmarking on A15.
> First off my assumption is that we will write our own boot and semi
> hosting code. (semi-hosting for TI emulators/simulators is different
> than ARM RDI semi-hosting.)
> I was planning on looking at the two toolchains here and here :
>  https://launchpad.net/linaro-toolchain-binaries
>  https://launchpad.net/gcc-arm-embedded
> I was then going to build a hybrid that was newlib based but appropriate
> for armv7-a (instead of cortext-m3) and maybe even -mtune'ed for A15.
> However looking at the gcc-arm-embedded release more I see that it
> supports ARMv7-R. It supports both thumb and non-thumb modes, both
> softfp and hardfp ABIs.
> What would I really gain by building my own? For app code the user
> should be able to add -mtune=cortex-a15 and still be compatible with the
> pre-built R4/R5 libraries. The only performance difference should be in
> the library code and that should be only pipeline tuning if I understand
> the difference between armv7-a and armv7-r correctly.
> Am I missing something? Should I build my hybrid anyway?
>  https://launchpadlibrarian.net/88152755/readme.txt
> [BTW: has the below project been obsoleted by the gcc-arm-embedded one?
> Perhaps gcc-arm-embedded should be referenced in the description of
> the page below.
> https://launchpad.net/linaro-toolchain-unsupported ]
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