Date: Wed, 29 Oct 2008 11:11:47 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Nathan Whitehorn <nwhitehorn@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r184429 - head/sys/powerpc/powermac Message-ID: <200810291111.47677.jhb@freebsd.org> In-Reply-To: <200810282209.m9SM9UMQ005356@svn.freebsd.org> References: <200810282209.m9SM9UMQ005356@svn.freebsd.org>
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On Tuesday 28 October 2008 06:09:30 pm Nathan Whitehorn wrote: > Author: nwhitehorn > Date: Tue Oct 28 22:09:30 2008 > New Revision: 184429 > URL: http://svn.freebsd.org/changeset/base/184429 > > Log: > DBDMA can transfer a maximum of 64K - 1 bytes per descriptor, as the byte > count field is 16 bits. Inform ATA of this fact. You may want to use 32k transfers rather than 63k. At least on the HT1000 chipsets we got severe data corruption even with 63k transfers, and I'm not sure if some part of the kernel isn't dependent on power-of-2 transfers somehow. -- John Baldwin
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