On Oct 31, 2005, at 22:09:32, David Brownell wrote:
Which logic? The fundamental thing those USB handoff functions
do is make sure that BIOS code lets go of the host controllers.
The main reason it'd be using a controller is because of USB
keyboards, mice, or maybe boot disks. Secondarily, that code
needs to make sure the controller is really quiesced before Linux
starts using it.
So you rant about "ppc specific" whatever while the entire point
of this code is to workaround x86 specific BIOS junk ...
Actually any "sophisticated" boot loader nowadays will know
something about USB, to handle keyboards, mice, or maybe boot disks.
OpenFirmware is quite knowledgeable about USB devices, both disks,
mice, keyboards, and IIRC there's even a USB<=>serial bridge useable
as an OpenFirmware console.
On some platforms, u-Boot understands OHCI ... so that's not just
x86 BIOS or other closed-source firmware.
On other platforms, OpenFirmware supports direct ELF loading without
any extra code. If you want initrd support, you need a little Forth
script (IE: yaboot) to load it into some RAM first.
The difference is, OpenFirmware is nice and clean and stops messing
with hardware before handing off to the new kernel. If you ever try
to boot from an invalid ELF file on an OpenFirmware machine, you'll
see that's fairly obvious, because the screen flashes and changes
state slightly during the failed boot attempt (after which it
reconnects to the hardware again to display messages).
Why should x86-specific-BIOS-USB-handoff-specific-crap-PCI-quirks be
even _compiled_ on PowerPC systems that have nothing remotely like
the affected hardware (BIOS & PS/2 serio chip)?
Cheers,
Kyle Moffett
--
Simple things should be simple and complex things should be possible
-- Alan Kay
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