[Sound-open-firmware] How do you provide the firmware binary, e.g sof-byt.ri file?

[Daniel Baluta]

On Mon, Dec 10, 2018 at 11:01 PM Pierre-Louis Bossart
<pierre-louis.bossart at linux.intel.com> wrote:
>
>
> On 12/10/18 2:48 PM, Daniel Baluta wrote:
> > On Mon, Dec 10, 2018 at 5:00 PM Liam Girdwood
> > <liam.r.girdwood at linux.intel.com> wrote:
> >> On Mon, 2018-12-10 at 07:48 -0600, Pierre-Louis Bossart wrote:
> >>>> I am having this problem where SOF is compiled as built in the
> >>>> kernel and the firmware binary is on the rootfs.
> >>>>
> >>>> When request_firmware is called in sof_probe the rootfs
> >>>> is not yet mounted so the call to request_firmware fails.
> >>>>
> >>>> Just curious, how do you provide the firmware binary?
> >>> it's a known issue that we haven't fixed since we use modules both for
> >>> development and production. Other drivers have the same problem IIRC.
> >>>
> >> You could try adding the image to initramfs, but as Pierre says this is a
> >> general problem with loading FW on Linux, not just related to audio.
> > I used CONFIG_EXTRA_FIRMWARE and compiled the firmware binary
> > inside the kernel Image and it works just fine for the moment.
> >
> > Yes, the easiest solution would be to add the image to initramfs.
> We use request_firmware as well for the topology file. Did you also
> include it in the kernel image?

I haven't got that far. For the moment I am just hacking around loading the
various sections of the firmware into memory (btw, I'm working on ARM board :D).

Anyhow, I assume that for the topology file it won't be necessary to compile
it inside the kernel image because it is used later when the rootfs is already
mounted.

thanks,
Daniel.