Re: ld at sdmmc

[Rafal Boni <rafal%pobox.com@localhost>]

On Mon, Sep 15, 2008 at 05:31:12AM -0700, Paul Goyette wrote:
> Wonderful news.  And I'm sure Jeremy Reed will be happy, too, especially 
> if it works on his amd64 machine.
> 
> I'll compare Kiyohara-san's version against my own and hopefully learn 
> why my attempt to do this didn't work!

Note that (IIRC) nonaka-san's original patches have some rather poor locking
and can be fairly easily pushed into bad states -- the locks I think were at
too high of a level, forcing recursive lock acquisition and a mess releasing
those locks when failures happen (this is all from memory, it's been a while
since I looked at the SDMMC code).

Maybe this gets better emulating an ld(4) vs. a SCSI device, but I recall
a lot of the problems were in the backend not the disk-emulation layer(s).

I spent a little bit of time trying to untangle this before I realized
that my iPAQ didn't use the PXA built-in SD/MMC controller, but instead
needed a totally new driver for the controller in the HTC ASIC(s); I
punted at that point.

--rafal

-- 
  Time is an illusion; lunchtime, doubly so.     |/\/\|           Rafal Boni
                   -- Ford Prefect               |\/\/|      
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