Date: Mon, 18 Apr 2011 14:02:52 -0600 From: Warner Losh <imp@bsdimp.com> To: Ian Lepore <freebsd@damnhippie.dyndns.org> Cc: freebsd-arm@FreeBSD.org Subject: Re: arm/155214: [patch] MMC/SD IO slow on Atmel ARM with modern large SD cards Message-ID: <2578F555-AFF8-405D-ACA2-914A765FE4BC@bsdimp.com> In-Reply-To: <201104181900.p3IJ0OWs079642@freefall.freebsd.org> References: <201104181900.p3IJ0OWs079642@freefall.freebsd.org>
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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@damnhippie.dyndns.org> > To: bug-followup@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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