arm/155214: [patch] MMC/SD IO slow on Atmel ARM with modern large SD cards

Warner Losh imp at bsdimp.com
Mon Apr 18 20:07:30 UTC 2011


On Apr 18, 2011, at 1:00 PM, Ian Lepore wrote:

> The following reply was made to PR arm/155214; it has been noted by GNATS.
> 
> From: Ian Lepore <freebsd at damnhippie.dyndns.org>
> To: bug-followup at FreeBSD.org
> Cc:  
> Subject: Re: arm/155214: [patch] MMC/SD IO slow on Atmel ARM with modern
> large SD cards
> Date: Mon, 18 Apr 2011 12:45:28 -0600
> 
> I have an updated patch for this which includes better error handling,
> and better read performance (mainly by splitting large IO requests into
> two DMA operations and doing the byte-swapping for the first half while
> the second half is still on the wire from the card).  It also has more
> comments about what works and what doesn't (ex: 30mhz 4-bit transfers
> when USB Host mode is also enabled).
> 
> I don't see any straightforward way on the PR page to nuke the original
> patch and supply a replacement.  What's the best way to handle that?

Just submit the patch as a followup.

Warner



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