andrzej zaborowski wrote:
> 2008/7/16 Michael Opdenacker <michael-lists@free-electrons.com>:
>> Hello qemu developers,
>>
>> I'm trying to test your implementation of sound support in the Sharp
>> Spitz machine emulated by qemu...
>>
>> The problem is that I haven't managed to find a Linux version in which
>> sound works.
>>
>> Here's the command line I used with Linux 2.6.26:
>>
>> qemu-system-arm -M spitz -show-cursor -soundhw all -m 256 -mtdblock /dev/null -kernel vmlinuz-arm-spitz-2.6.26 -hda root-arm.ext2 -append "root=/dev/hda rootfstype=ext2 rw"
>>
>> The kernel, root filesystem and the kernel configuration files can be
>> found on http://free-electrons.com/issues/qemu/jul16-2008/ (the upload
>> will be complete in less than an hour)
>>
>> Here's what I get in the kernel log when I try to modprobe the
>> snd-soc-spitz module (full log on
>> http://free-electrons.com/issues/qemu/jul16-2008/dmesg.log)
>>
>> ASoC version 0.13.2
>> WM8750: WM8750 Audio Codec 0.12
>> i2c: error: exhausted retries
>> i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
>> i2c: ICR: 000007e0 ISR: 00000002
>> i2c: log: [00000442:000007e0]
>>
>> Here are more details after adding I2C debug options (full log on
>> http://free-electrons.com/issues/qemu/jul16-2008/dmesg-debug.log)
>>
>> ASoC version 0.13.2
>> WM8750: WM8750 Audio Codec 0.12
>> i2c-core: driver [WM8750 I2C Codec] registered
>> i2c-adapter i2c-1: found normal entry for adapter 1, addr 0x1b
>> i2c-adapter i2c-1: master_xfer[0] W, addr=0x1b, len=0
>> i2c-adapter i2c-1: setting to bus master
>> i2c-adapter i2c-1: state:i2c_pxa_handler:876: ISR=00000442,
>> ICR=000007e1, IBMR=00
>> i2c-adapter i2c-1: state:i2c_pxa_irq_txempty:832: ISR=00000002,
>> ICR=000007e0, IBMR=00
>> i2c-adapter i2c-1: Retrying transmission
>> i2c-adapter i2c-1: setting to bus master
>> i2c-adapter i2c-1: state:i2c_pxa_handler:876: ISR=00000442,
>> ICR=000007e1, IBMR=00
>> i2c-adapter i2c-1: state:i2c_pxa_irq_txempty:832: ISR=00000002,
>> ICR=000007e0, IBMR=00
>> i2c-adapter i2c-1: Retrying transmission
>> i2c-adapter i2c-1: setting to bus master
>> i2c-adapter i2c-1: state:i2c_pxa_handler:876: ISR=00000442,
>> ICR=000007e1, IBMR=00
>> i2c-adapter i2c-1: state:i2c_pxa_irq_txempty:832: ISR=00000002,
>> ICR=000007e0, IBMR=00
>> i2c-adapter i2c-1: Retrying transmission
>> i2c-adapter i2c-1: setting to bus master
>> i2c-adapter i2c-1: state:i2c_pxa_handler:876: ISR=00000442,
>> ICR=000007e1, IBMR=00
>> i2c-adapter i2c-1: state:i2c_pxa_irq_txempty:832: ISR=00000002,
>> ICR=000007e0, IBMR=00
>> i2c-adapter i2c-1: Retrying transmission
>> i2c-adapter i2c-1: setting to bus master
>> i2c-adapter i2c-1: state:i2c_pxa_handler:876: ISR=00000442,
>> ICR=000007e1, IBMR=00
>> i2c-adapter i2c-1: state:i2c_pxa_irq_txempty:832: ISR=00000002,
>> ICR=000007e0, IBMR=00
>> i2c-adapter i2c-1: Retrying transmission
>> i2c-adapter i2c-1: setting to bus master
>> i2c-adapter i2c-1: state:i2c_pxa_handler:876: ISR=00000442,
>> ICR=000007e1, IBMR=00
>> i2c-adapter i2c-1: state:i2c_pxa_irq_txempty:832: ISR=00000002,
>> ICR=000007e0, IBMR=00
>> i2c-adapter i2c-1: Retrying transmission
>> i2c: error: exhausted retries
>> i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
>> i2c: ICR: 000007e0 ISR: 00000002
>> i2c: log: [00000442:000007e0]
>>
>> I also tried 2.6.23, 2.6.24 and 2.6.25, but with no success either. I
>> both tested qemu 0.9.1 from Ubuntu Hardy and a svn snapshot I compiled
>> yesterday (Jul 15, 2008).
>>
>> How did you test the emulated WM8750 chip on the Spitz machine? Working
>> kernel configurations and qemu command line options are welcome!
> 
> I tested it with kernels and rootfs'es from pokylinux.org autobuilder,
> but they may have stopped working in the meantime. :(
> When I last tried to build a kernel for spitz outside OE, I had to
> apply ASoC patches from opensource.wolfsonmicro.com because ASoC was
> not in mainline yet (2.6.19 I think).
> 
>> Are there any other options to get both framebuffer and sound support
>> with qemu-system-arm?
> 
> Not any of those which have full Linux mainline support. Otherwise
> there is the PalmT|E (cheetah), MusicPal and Neo1973.

...with MusicPal not being mainline either. (Specifically the audio
driver that comes with that device is something you don't want to look
at. Really.)

Jan