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Code Issues Releases Activity

Remove the dual-address cycle stuff. DAC is used to allow a bus master

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device to access 64-bit addresses from a 32-bit PCI bus. While the
RealTek manual says you can set this bit and the chip will perform
DAC only if you give it a DMA address with any of the upper 32
bits set, this appears not to be the case. If I turn on the DAC
bit, the chip sets the 'system error' bit in the status register
when I to do a DMA on my Athlon test box with 32-bit PCI bus (VIA
chipset) even though I only have 128MB of physical memory, and thus
can never give the chip a 64-bit address.

Obviously, I can't just set it and forget it, so until I figure
out the right rule for when it's safe/necessary to enable it, keep
it turned off.
This commit is contained in:
Bill Paul 2003-09-20 21:18:27 +00:00
parent 5249fed37f
commit edd033746c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120299
1 changed files with 2 additions and 4 deletions
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6
sys/dev/re/if_re.c
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@ -2081,14 +2081,12 @@ re_init(xsc)
/*
* Enable C+ RX and TX mode, as well as VLAN stripping and
* RX checksum offload. Only enable dual-address cycle if
* we're on a 64-bit bus. We must configure the C+ register
* RX checksum offload. We must configure the C+ register
* before all others.
*/
CSR_WRITE_2(sc, RL_CPLUS_CMD, RL_CPLUSCMD_RXENB|
RL_CPLUSCMD_TXENB|RL_CPLUSCMD_PCI_MRW|
(CSR_READ_1(sc, RL_CFG2) & RL_BUSWIDTH_64BITS ?
RL_CPLUSCMD_PCI_DAC : 0)|RL_CPLUSCMD_VLANSTRIP|
RL_CPLUSCMD_VLANSTRIP|
(ifp->if_capenable & IFCAP_RXCSUM ?
RL_CPLUSCMD_RXCSUM_ENB : 0));