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Some RealTek chips are known to be buggy on DAC handling, so

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disable DAC by default.
This commit is contained in:
Pyun YongHyeon 2008-03-23 05:13:45 +00:00
parent ccf34c81f8
commit ce6283934e
1 changed files with 6 additions and 1 deletions
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7
sys/dev/re/if_re.c
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@ -989,9 +989,14 @@ re_allocmem(dev, sc)
/*
* Allocate the parent bus DMA tag appropriate for PCI.
* In order to use DAC, RL_CPLUSCMD_PCI_DAC bit of RL_CPLUS_CMD
* register should be set. However some RealTek chips are known
* to be buggy on DAC handling, therefore disable DAC by limiting
* DMA address space to 32bit. PCIe variants of RealTek chips
* may not have the limitation but I took safer path.
*/
error = bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
BUS_SPACE_MAXSIZE_32BIT, 0, BUS_SPACE_MAXSIZE_32BIT, 0,
NULL, NULL, &sc->rl_parent_tag);
if (error) {