linux-kernel - Re: Using s3virge card in Sun Blade 2000

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Message-ID: <1294173502.17576.26.camel@lithium>
Date:	Tue, 04 Jan 2011 20:38:22 +0000
From:	Alex Buell <alex.buell@...ted.org.uk>
To:	David Miller <davem@...emloft.net>
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Using s3virge card in Sun Blade 2000

On Tue, 2011-01-04 at 12:19 -0800, David Miller wrote:

> First of all, the machine dies because those illegal I/O accesses
> generate an unrecoverable asynchronous memory error, we cannot recover
> from it so we have to panic the entire machine.
> 
> Secondly, the keyboard doesn't work because I never implemented the
> monstrous amount of code necessary to allow USB keyboard to work with
> OpenPROM after booting up.
> 
> You have to essentially reset the entire USB host controller, unload
> all of the pending queued URBs in the host controller, put it into a
> quiescent state, and then asynchronously process all USB keyboard
> device events via USB host controller polling implemented via OpenPROM
> backcalls into the kernel, and from there feed the characters to
> OpenPROM so it can see the keypresses.  Upon return from OpenPROM you
> have to reload all of the unloaded URBs back onto the USB host
> controller queues so the kernel can use USB again.
> 
> I never considered this enormous amount of work worth doing, the
> payback is just too small.

Thank you for that explanation, it's much appreciated.
-- 
Tactical Nuclear Kittens
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