diff options
| -rw-r--r-- | src/drivers/net/realtek.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/drivers/net/realtek.c b/src/drivers/net/realtek.c index f63f25f..98fc02f 100644 --- a/src/drivers/net/realtek.c +++ b/src/drivers/net/realtek.c @@ -878,10 +878,15 @@ static void realtek_detect ( struct realtek_nic *rtl ) { /* The C+ Command register is present only on 8169 and 8139C+. * Try to enable C+ mode and PCI Dual Address Cycle (for * 64-bit systems), if supported. + * + * Note that enabling DAC seems to cause bizarre behaviour + * (lockups, garbage data on the wire) on some systems, even + * if only 32-bit addresses are used. */ cpcr = readw ( rtl->regs + RTL_CPCR ); - cpcr |= ( RTL_CPCR_DAC | RTL_CPCR_MULRW | RTL_CPCR_CPRX | - RTL_CPCR_CPTX ); + cpcr |= ( RTL_CPCR_MULRW | RTL_CPCR_CPRX | RTL_CPCR_CPTX ); + if ( sizeof ( physaddr_t ) > sizeof ( uint32_t ) ) + cpcr |= RTL_CPCR_DAC; writew ( cpcr, rtl->regs + RTL_CPCR ); check_cpcr = readw ( rtl->regs + RTL_CPCR ); |