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 */