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Re: [Qemu-devel] enabling bus-master IDE driver
From: |
Jens Axboe |
Subject: |
Re: [Qemu-devel] enabling bus-master IDE driver |
Date: |
Sun, 7 Nov 2004 10:03:28 +0100 |
On Sat, Nov 06 2004, Jason Brittain wrote:
> Johannes Schindelin wrote:
> >Hi,
> >
> >On Fri, 5 Nov 2004, Jason Brittain wrote:
> >
> >
> >>/dev/hda:
> >> setting using_dma to 1 (on)
> >> HDIO_SET_DMA failed: Operation not permitted
> >> using_dma = 0 (off)
> >
> >Are you sure you did as guest root? This error could happen if you try to
> >use hdparm as a plain user.
>
> I was most certainly logged in as root in the guest Linux
> when I did that.
I has nothing to do with user privilege, you are most likely getting
EPERM because the drive doesn't flag dma capability.
put_le16(p + 49, 1 << 9); /* LBA supported, no DMA */
mask that with 1 << 8 and it'll most likely work.
Index: hw/ide.c
===================================================================
RCS file: /cvsroot/qemu/qemu/hw/ide.c,v
retrieving revision 1.28
diff -u -r1.28 ide.c
--- hw/ide.c 9 Oct 2004 20:27:55 -0000 1.28
+++ hw/ide.c 7 Nov 2004 09:06:33 -0000
@@ -416,7 +416,7 @@
put_le16(p + 47, 0x8000 | MAX_MULT_SECTORS);
#endif
put_le16(p + 48, 1); /* dword I/O */
- put_le16(p + 49, 1 << 9); /* LBA supported, no DMA */
+ put_le16(p + 49, 1 << 9 | 1 << 8); /* DMA and LBA supported */
put_le16(p + 51, 0x200); /* PIO transfer cycle */
put_le16(p + 52, 0x200); /* DMA transfer cycle */
put_le16(p + 53, 1); /* words 54-58 are valid */
--
Jens Axboe
- Re: [Qemu-devel] enabling bus-master IDE driver, (continued)
- Re: [Qemu-devel] enabling bus-master IDE driver, zitu, 2004/11/05
- Re: [Qemu-devel] enabling bus-master IDE driver, zitu, 2004/11/05
- Re: [Qemu-devel] enabling bus-master IDE driver, Jason Brittain, 2004/11/05
- Re: [Qemu-devel] enabling bus-master IDE driver, Johannes Schindelin, 2004/11/06
- Re: [Qemu-devel] enabling bus-master IDE driver, James Boddington, 2004/11/06
- Re: [Qemu-devel] enabling bus-master IDE driver, James Boddington, 2004/11/06
- Re: [Qemu-devel] enabling bus-master IDE driver, zitu, 2004/11/06
- Re: [Qemu-devel] enabling bus-master IDE driver, jeebs, 2004/11/06
- Re: [Qemu-devel] enabling bus-master IDE driver, Jason Brittain, 2004/11/07
- Re: [Qemu-devel] enabling bus-master IDE driver, Jason Brittain, 2004/11/06
- Re: [Qemu-devel] enabling bus-master IDE driver,
Jens Axboe <=
- Re: [Qemu-devel] enabling bus-master IDE driver, Jens Axboe, 2004/11/07
- Re: [Qemu-devel] enabling bus-master IDE driver, Jens Axboe, 2004/11/07
- Re: [Qemu-devel] enabling bus-master IDE driver, Hetz Ben Hamo, 2004/11/07
- Re: [Qemu-devel] enabling bus-master IDE driver, Jens Axboe, 2004/11/07
- Re: [Qemu-devel] enabling bus-master IDE driver, zitu, 2004/11/08
- RE: [Qemu-devel] enabling bus-master IDE driver, Andreas Bollhalder, 2004/11/08
- Re: [Qemu-devel] enabling bus-master IDE driver, Paul Jakma, 2004/11/09
- Re: [Qemu-devel] enabling bus-master IDE driver, Hetz Ben Hamo, 2004/11/09
- Re: [Qemu-devel] enabling bus-master IDE driver, Paul Jakma, 2004/11/09
- Re: [Qemu-devel] enabling bus-master IDE driver, Jason Brittain, 2004/11/11