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0dacd54174
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>
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