On Sun, 30 Jun 2013, Brad Boyer wrote:
On Sat, Jun 29, 2013 at 02:47:34PM +1000, Finn Thain wrote:
The devices attached to the IOPs are SWIM, SCC and ADB. iop_preinit()
places the SCC channel in bypass mode, so we don't need iop_init() to
use the SCC. ADB doesn't start until device_initcall(adb_init).
It could become more complicated if we started using the SCC IOP and
wanted to be able to do serial console, although I suppose we could use
bypass mode until the real driver is loaded later and switch at runtime.
It would make some things messy but might still be simpler than
complicating this part of the code.
I can't imagine anyone writing an IOP-based SCC driver unless they wanted
to implement DMA and LocalTalk support. The present code should work fine
with the pmac_zilog serial driver. It should also work with EARLY_CONSOLE
if MacOS is configured to put the IOPs into bypass (aka "compatible") mode
before Penguin boots Linux.
Finn
Brad Boyer
flar@xxxxxxxxxxxxx
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