Date: Fri, 1 Feb 2013 19:52:18 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG Subject: stable/9: Force ada1 to UDMA-33 Message-ID: <201302011852.r11IqIve093221@grabthar.secnetix.de>
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Hello, I've got a (P)ATA disk in a special frame. The disk itself supports UDMA-100 (and has an 80-ribbon cable), but the frame isn't compatible with that. By default, FreeBSD negotiates UDMA-100, and the console starts to fill with ICRC errors. In the past, I used a patch to ata-all.c that enabled the following entry in loader.conf to force the disk to UDMA-33, so it worked fine: hw.ata.ata_dma_limit="2" But with the "new world", that doesn't work anymore. What is the proper way with ATA_CAM and ada(4) to force a P-ATA disk to a lower UDMA mode? Best regards Oliver PS: Excerpt from dmesg ... atapci0: <VIA 8235 UDMA133 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xd800-0xd80f at device 17.1 on pci0 ata0: <ATA channel> at channel 0 on atapci0 ata1: <ATA channel> at channel 1 on atapci0 ada0 at ata0 bus 0 scbus0 target 0 lun 0 ada0: <IBM-DJNA-352500 J51OA30K> ATA-4 device ada0: 66.700MB/s transfers (UDMA4, PIO 8192bytes) ada0: 24405MB (49981680 512 byte sectors: 16H 63S/T 16383C) ada0: Previously was known as ad0 ada1 at ata1 bus 0 scbus1 target 0 lun 0 ada1: <ST3250824A 3.AAE> ATA-7 device ada1: 100.000MB/s transfers (UDMA5, PIO 8192bytes) ada1: 238475MB (488397168 512 byte sectors: 1H 255S/T 16383C) ada1: Previously was known as ad2 (ada1:ata1:0:0:0): READ_DMA. ACB: c8 00 00 00 00 40 00 00 00 00 10 00 (ada1:ata1:0:0:0): CAM status: ATA Status Error (ada1:ata1:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 84 (ICRC ABRT ) (ada1:ata1:0:0:0): RES: 51 84 00 00 00 00 00 00 00 00 00 (ada1:ata1:0:0:0): Retrying command (ada1:ata1:0:0:0): READ_DMA. ACB: c8 00 00 00 00 40 00 00 00 00 10 00 (ada1:ata1:0:0:0): CAM status: ATA Status Error (ada1:ata1:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 84 (ICRC ABRT ) (ada1:ata1:0:0:0): RES: 51 84 00 00 00 00 00 00 00 00 00 (ada1:ata1:0:0:0): Retrying command .. -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing Handelsregister: Amtsgericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsreg.: Amtsgericht München, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen/-Produkte + mehr: http://www.secnetix.de/bsd Perl is worse than Python because people wanted it worse. -- Larry Wall
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