Re: [Qemu-devel] New documentation for the LatticeMicro32 target

[Michael Walle]

Am 2017-07-17 17:18, schrieb Programmingkid:
> > On Jul 17, 2017, at 10:56 AM, Programmingkid 
> > <address@hidden> wrote:
> >
> >
> > > On Jul 17, 2017, at 1:40 AM, Michael Walle <address@hidden> wrote:
> > >
> > > Am 2017-07-09 17:39, schrieb Programmingkid:
> > > > I just made a documentation page for the LatticeMicro32 target. I 
> > > > need
> > > > to know its current status, how much of this system is implemented,
> > > > what software runs on it. If anyone could supply more information 
> > > > that
> > > > would be appreciated. Pictures of this target running would be great
> > > > as well. Thanks.
> > > > Here is the page: 
> > > > http://wiki.qemu.org/Documentation/Platforms/LatticeMico32
> > >
> > > Hi,
> > >
> > > thank you for your efforts. I have to admit that the current status 
> > > is unknown.
> > >
> > > I've just compiled the latest head and it looks like the BQL is 
> > > missing for the interrupt helpers. I'll post a patch soon. With the 
> > > patch, the basic stuff is working but there seems to be an issue with 
> > > OpenGL.
> > >
> > > You can read the quickstart instructions at:
> > > http://milkymist.walle.cc/README.qemu
> > >
> > > The flash image isn't working because it will boot right into the 
> > > visualization mode, which is using the OpenGL stuff. The "-kernel 
> > > flickernoise" method is working though. You can get the flickernoise 
> > > binary at:
> > > http://milkymist.walle.cc/updates/current/flickernoise
> > >
> > > Besides the milkymist emulation, there is plain lm32 emulation based 
> > > on the Lattice reference design which should be ok, because the tests 
> > > are working (make -C tests/tcg/lm32 check)
> > >
> > > -michael
> >
> > Thank you for all this information. It has been added to the wiki 
> > page.
>
> I just tried qemu-system-lm32 and it crashed.
>
> Command-line: qemu-system-lm32 -M milkymist -kernel flickernoise
>
> Error message: audio: Failed to create voice `mm_ac97.in'
> **
> ERROR: /accel/tcg/tcg-all.c:42:tcg_handle_interrupt: assertion failed:
> (qemu_mutex_iothread_locked())
> Abort trap: 6
>
> Host: Mac OS 10.12.5

As I said before, I guess the BQL is missing here. Try the following 
patch:

diff --git a/target/lm32/op_helper.c b/target/lm32/op_helper.c
index 2177c8ad12..93b8d09794 100644
--- a/target/lm32/op_helper.c
+++ b/target/lm32/op_helper.c
@@ -102,12 +102,16 @@ void HELPER(wcsr_dc)(CPULM32State *env, uint32_t 
dc)

 void HELPER(wcsr_im)(CPULM32State *env, uint32_t im)
 {
+    qemu_mutex_lock_iothread();
     lm32_pic_set_im(env->pic_state, im);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(wcsr_ip)(CPULM32State *env, uint32_t im)
 {
+    qemu_mutex_lock_iothread();
     lm32_pic_set_ip(env->pic_state, im);
+    qemu_mutex_unlock_iothread();
 }

 void HELPER(wcsr_jtx)(CPULM32State *env, uint32_t jtx)



-michael