Date: Tue, 16 Oct 2012 21:18:13 -0700 From: Isaac Dunham <idunham@...abit.com> To: musl@...ts.openwall.com Subject: Re: microblaze: big endian or little endian (or both)? On Tue, 16 Oct 2012 23:13:44 -0400 Rich Felker <dalias@...ifal.cx> wrote: > On Tue, Oct 16, 2012 at 08:05:41PM -0700, Isaac Dunham wrote: > > I'm trying to get stuff set up to run microblaze musl (first user > > emulation, then system emulation if all goes well). > > > > Anyhow, I'm wondering about whether to just use microblaze or if > > microblazeel should work also (configure only says microblaze-* > > which seems to imply that only the BE version is supported). > > I don't see any reason little endian wouldn't work; I wasn't aware > that it even existed. Aside from some workarounds for kernel struct > layout and other ugly ABI issues on some archs, musl is completely > endian-agnostic. OK, thanks! Somehow this gets me wondering about the endian.h issue... #set ENDIAN in the first round to the per-arch default case "$target" in *el-* | *el) ENDIAN=BE ;; *eb-* | *eb) ENDIAN=LE ;; *) ;; #Just use the default endianness esac then, have ENDIAN determine whether to use the big-endian or little-endian header: ln -s arch/$ENDIAN/endian.h include/bits/endian.h clean: cleanendian cleanendian: rm include/bits/endian.h > > Other than that, I have a few random thoughts on microblaze systems > > to experiment with: > > > > 1. The xldk git repos have initrds for microblaze; if you inject > > musl binaries in there, how does that work in qemu? > > Haven't tried. I'd really rather figure out how to get rootfs-on-9p > working and use that for all my qemu-system experimentation. Yikes. That might take a while... > > 2. Apparently it's possible (just barely) to get a Linux-capable > > microblaze design onto a Spartan 6, which runs ~$90... > > Nice. Any idea what the performance is like? According to http://billauer.co.il/blog/2011/09/dma-capture-frame-grabbing-xilinx-fpga-linux-microblaze/ it's 70-100mhz effectively; microblaze seems to be extremely slow. And yet they stuck a gigabit ethernet port on it. -- Isaac Dunham <idunham@...abit.com>
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