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| author | Michael Brown | 2012-08-23 14:35:19 +0200 |
|---|---|---|
| committer | Michael Brown | 2012-08-23 16:15:43 +0200 |
| commit | 0dacd54174a78d32f7bfff958dd120f04f130f4b (patch) | |
| tree | a1e9e608d209b6957a4bfe9bf0a2efccbb8cd70d /src/include | |
| parent | [realtek] Use read-modify-write to check for C+ Command register (diff) | |
| download | ipxe-0dacd54174a78d32f7bfff958dd120f04f130f4b.tar.gz ipxe-0dacd54174a78d32f7bfff958dd120f04f130f4b.tar.xz ipxe-0dacd54174a78d32f7bfff958dd120f04f130f4b.zip | |
[realtek] Enable DAC only when built as a 64-bit binary
Some RTL8169 cards (observed with an RTL8169SC) crash and burn if DAC
is enabled, even if only 32-bit addresses are used. Observed
behaviour includes system lockups and repeated transmission of garbage
data onto the wire.
This seems to be a known problem. The Linux r8169 driver disables DAC
by default and provides a "use_dac" module parameter.
There appears to be no known test for determining whether or not DAC
will work. As a workaround, enable DAC only if we are built as as
64-bit binary. This at least eliminates the problem in the common
case of a 32-bit build, which will never use 64-bit addresses anyway.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/include')
0 files changed, 0 insertions, 0 deletions