On 04/23/2014 05:45 PM, Guenter Roeck wrote: > On Wed, Apr 23, 2014 at 04:12:59PM +0200, Michal Simek wrote: >> On 04/23/2014 03:38 PM, Guenter Roeck wrote: >>> On 04/22/2014 10:32 PM, Michal Simek wrote: >>>> Hi Guenter, >>>> >>>> >>>> On 04/22/2014 07:23 PM, Guenter Roeck wrote: >>>>> Hi all, >>>>> >>>>> when trying to run a microblaze image with 3.15-rc1 or 3.15-rc2 in qemu, >>>>> I get the following hangup. This used to work with earlier kernels >>>>> with the same configuration. >>>>> >>>>> Is this a known problem, or is something wrong with my configuration >>>>> or with my qemu command line ? >>>> >>>> Is this BE/LE version? Which qemu do you use? >>> >>> BE. >>> >>> file vmlinux: >>> >>> vmlinux: ELF 32-bit MSB executable, version 1 (SYSV), statically linked, >>> BuildID[sha1]=5e1872c08df2956eddaed6fc1f6528a8540375b7, not stripped >>> >>> qemu-system-microblaze --version: >>> >>> QEMU emulator version 1.7.0, Copyright (c) 2003-2008 Fabrice Bellard >>> >>> gcc --version: >>> >>> microblaze-linux-gcc (GCC) 4.8.0 >>> Copyright (C) 2013 Free Software Foundation, Inc. >>> This is free software; see the source for copying conditions. There is NO >>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. >>> >>>> There is endian autodetection in timer and intc driver >>>> which can caused this problem. >>>> >>> Is this new code ? I didn't see the problem in 3.13 (same compile options, >>> same configuration, same compiler, same qemu version). >> >> yes it was added to 3.15-rc1. >> >> Try to rever this one >> a66a626 microblaze: Use asm-generic/io.h >> >> but the problem is probably here because you are not getting proper >> reaction from qemu model. >> a1715bb microblaze: Make timer driver endian aware >> 1aa1243 microblaze: Make intc driver endian aware >> >> I have tested it on the latest petalinux qemu and there shouldn't be >> any problem. >> > Hi Michal, > > qemu 2.0.0 still has the problem. Bisect points to > > commit a66a626538af65cbfc611e2b2fce500ed3f24518 > Author: Michal Simek <[email protected]> > Date: Thu Feb 7 15:12:24 2013 +0100 > > microblaze: Use asm-generic/io.h > > as the culprit, so you were right on the money. Reverting this commit > fixes the problem.
yep. But it is just side effect of previous two commits I have mentioned.
Can you just please check if you are setting up correct IO functions?
write_fn = timer_write32;
read_fn = timer_read32;
write_fn(TCSR_MDT, timer_baseaddr + TCSR0);
if (!(read_fn(timer_baseaddr + TCSR0) & TCSR_MDT)) {
write_fn = timer_write32_be;
read_fn = timer_read32_be;
}
git
> Assuming this is in fact a problem with qemu, can you point me to a set
> of qemu patches necessary to fix it ? Also, do you know if there are plans
> to send the patches upstream ? I don't find anything related in the qemu
> repository (though of course I may have missed it).
Yes, it should be qemu issue. I am not aware about particular qemu patches
but you can try to use https://github.com/Xilinx/qemu
but now sure if Peter updating this repository.
Anyway if you look at code above and I expect that the problem is just
that autodetection is broken in your qemu it should be pretty simple
to fix it.
Thanks,
Michal
--
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform
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