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On Thu, Nov 06, 2003 at 01:34:35AM -0500, Jason Papadopoulos wrote: > > Hello. 2.4.21-rc could not start DMA at boot time on > my system, but hdparm could turn it on afterwards. Now > with 2.4.22, nothing will turn on DMA; using hdparm > locks the machine immediately. > > The machine in question is an DS10 Alphaserver, Ali > M5229 rev c0 IDE controller. Has 2.4.23-pre made any > fixes for this device? Yes - setup_irq() fix in 2.4.23-pre8 (arch/alpha/kernel/irq.c) had fixed IDE hangs on DS10 (verified for 5229 rev c1). If that doesn't help, try to narrow it down - try 2.4.21-* + irq.c change and see where does it stop working. It should be able to do DMA at boot time, BTW: wynton:~# dmesg |head -2 Linux version 2.4.23-pre8 (al@wynton) (gcc version 3.3.2 20031005 (Debian prerelease)) #1 SMP Fri Oct 24 04:27:45 EDT 2003 Booting GENERIC on Tsunami variation Webbrick using machine vector Webbrick from SRM wynton:~# lspci |grep M5229 00:0d.0 IDE interface: ALi Corporation M5229 IDE (rev c1) wynton:~# hdparm -i /dev/hdc|grep modes PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 udma3 udma4 wynton:~# hdparm -i /dev/hda|grep modes PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2 DS10 with cdrom on hda and disk on hdc, no ide-related arguments in command line. Revision c0 won't do UDMA, but it should be able to do DMA just fine... What configuration do you have? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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