Date: Mon, 26 Mar 2007 10:48:52 -0400 From: John Baldwin <jhb@freebsd.org> To: alpha@freebsd.org Subject: bus dma fixes Message-ID: <200703261048.52874.jhb@freebsd.org>
index | next in thread | raw e-mail
Can folks please try this patch (warning, not compile tested) to fix some issues with bus_dma and hopefully fix ATA DMA on Alpha 6.x? http://www.FreeBSD.org/~jhb/patches/ata_alpha_dma.patch It fixes the bus_dma code so that bus_dmamap_load() uses _bus_dmamap_load_buffer(). This results in some fixes as noted in PR 75317 where bus_dmamap_load() wasn't honoring the maximum segment size for example. It also now bounces buffers that aren't properly aligned. It also now supports bounce pages for mbufs and uio's. As a sledgehammer fix for ATA on alpha, it limits the maximum segment size to 8k for ata(4) on alpha. Does anyone have any more details on the PYXIS bug? For example, does it only affect ata(4) or does it affect any DMA in the system? If the latter, I would rather add a check into the bus dma code to trunc maxsegsize to 8k for all tags on broken systems. -- John Baldwinhome | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200703261048.52874.jhb>