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[Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClib
From: |
Blue Swirl |
Subject: |
[Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.) |
Date: |
Sat, 20 Feb 2010 19:34:44 +0200 |
On 2/20/10, Rob Landley <address@hidden> wrote:
> On Thursday 18 February 2010 05:21:16 Artyom Tarasenko wrote:
> > 2010/2/17 Rob Landley <address@hidden>:
> > > But it does imply that qemu is capable of decently running _something_ on
> > > sparc, so the problems I'm seeing are more likely to be uClibc or
> > > toolchain issues.
> >
> > qemu-sparc can decently run debian-40r8: gcc and all the other stuff
> > seem to work.
> >
> > Most versions of the NetBSD boot. Some require the original OBP
> > though. The only known to me version which definetely doesn't boot is
> > 3.0.2.
> >
> > Also since the last dma fix Solaris 2.4-2.5.1 seems to be also fully
> > functional. Don't have a suitable compiler to check whether it's
> > working under Solaris though.
> >
> > Debian-40r8 should have all the necessary stuff to build the uClibc
> > toolchain, right?
>
> So I did a network install of that Debian image into a 4 gig disk image, and
> made some progress.
>
> First a quick bug report: qemu-system-sparc tries to set the video window to
> 900 pixels vertical, but my laptop's display is only 800 pixels tall, and the
> window manager trims it a bit more than that for the toolbar. The kernel
> booting up seems to think the graphics window is still its original size
> renders text off the bottom of it. But for some reason I can grab the window
> and resize it, and when I do this the emulated kernel's frame buffer gets the
> update and resizes its console to show the correct number of lines of text
> for
> the new size! (So my question is, why didn't it get the size right when the
> window manager first resized it before I manually resized it again?)
>
> Anyway: yay emulated sparc debian, I installed it, got a reasonable
> environment going, extracted my root filesystem image under there and
> chrooted
> into it... and everything worked fine. (Well, trying to run a dynamically
> linked "hello world" still died with a bus error, but using the static
> busybox
> I could mount a tmpfs and list its contents, which I never could before.)
>
> My plan had been to use sparc-debian's copy of gdb to track down why the
> binaries were going funky... but in that environment, they were behaving
> themselves. Same binaries, built with the same toolchain, same qemu-system-
> sparc, same -M and -cpu and so on...
>
> So I think "A-ha! Booting a different kernel! That's gotta be it!"
>
> The debian-sparc image is using a 2.6.18 kernel (and I'm using a 2.6.32
> kernel), but it installed the relevant .config in /boot, so I copied that out
> with scp, did a "make oldconfig" up to 2.6.32 (holding down the enter key
> until
> it shut up), stripped out all the modules and disabled module support, put
> back in CONFIG_SERIAL_SUNZILOG_CONSOLE=y and friends, procfs, sysfs, and
> tmpfs
> (strange things to have as modules?), and CONFIG_SQUASHFS (that's my default
> root filesystem format).
>
> I booted the result up with init=/bin/ash, did a "mount -t tmpfs /tmp /tmp",
> and then:
>
> / # ls -l /tmp
> Illegal instruction
>
> It's still misbehaving. Huh.
>
> This is as close as I can get to the debian kernel config without adding
> module
> support to my images (which is unnecessary complication for what they do). I
> can try an ext2 root filesystem image but I don't see how that would cause
> this.
>
> The part I don't understand is that same busybox binary, built with the same
> toolchain, worked just fine under the Debian kernel. I'd blame my toolchain,
> but in a slightly different context THE BINARIES WORKED...
>
> I don't understand what's going wrong here. Did the kernel break on sparc
> sometime between 2.6.18 and 2.6.32 and nobody noticed? Is sparc using
> software emulated floating point at the kernel level and that's configured
> as a
> module? (Except I don't think busybox ls uses floating point...)
Sparc32 is not maintained anymore so maybe it broke at some point.
There was some discussion a few years ago.
> Do any sparc people understand what's going on here? My next step is to grab
> a 2.6.18 kernel and try to get _that_ to work with the tweaked debian config
> (and an ext2 root filesystem since squashfs wasn't merged back then and had a
> format change when it was merged). But I'm mostly flailing around blind
> here...
I'm also trying different kernels using my .config. But already 2.6.12
hangs in ESP probe.
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., (continued)
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/17
- Re: [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Blue Swirl, 2010/02/17
- Re: [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Artyom Tarasenko, 2010/02/18
- Re: [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/18
- Re: [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Artyom Tarasenko, 2010/02/18
- Re: [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/18
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Artyom Tarasenko, 2010/02/18
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/18
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Artyom Tarasenko, 2010/02/18
- [Qemu-devel] Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.), Rob Landley, 2010/02/20
- [Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.),
Blue Swirl <=
- [Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.), Rob Landley, 2010/02/20
- [Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.), Blue Swirl, 2010/02/20
- [Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.), Rob Landley, 2010/02/20
- [Qemu-devel] Commit 085219f79cad broke Sparc-32 back in 2.6.28., Rob Landley, 2010/02/21
- [Qemu-devel] Re: Commit 085219f79cad broke Sparc-32 back in 2.6.28., David Miller, 2010/02/22
- [Qemu-devel] Re: Commit 085219f79cad broke Sparc-32 back in 2.6.28., Bartlomiej Zolnierkiewicz, 2010/02/22
- [Qemu-devel] Re: Commit 085219f79cad broke Sparc-32 back in 2.6.28., Rob Landley, 2010/02/21
- [Qemu-devel] Re: Commit 085219f79cad broke Sparc-32 back in 2.6.28., David Miller, 2010/02/22
- [Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.), Artyom Tarasenko, 2010/02/20
- [Qemu-devel] Re: Fun with sparc (was Re: qemu-ppc can't run static uClibc binaries.), Artyom Tarasenko, 2010/02/20