Comment 35 for bug 1609750

From the discussion over there it sounds to me that Coreboot itself does no sound initialization, but the 'depthcharge' payload started from Coreboot when booting to ChromeOS does do a codec init.

However SeaBIOS payload doesn't do anything sound initialization related so it'd be wished that the kernel would do that instead if it wasn't done by the Coreboot and its payload.