Re: 2.4.9-ac17 Adaptec AIC7XXX problems (new driver, old one works fine) (solved)

Justin T. Gibbs (gibbs@scsiguy.com)
Sun, 30 Sep 2001 10:15:30 -0600

>Hrm... this makes me wonder if the Byte Merge option is keeping the PCI
>consistancy rules, or perhaps the aic7xxx driver is making assumptions
>about when PCI writes are actually occuring, without doing a read cycle
>between critical writes to make sure they actually happen.

See my other post on this subject. The driver knows that a read is
required to ensure that a write is posted, but assumes that 8bit
transactions are forwarded as such, writes are issued in the order
retired (we use a memory barrier to avoid the compiler using a
different order), and that reads cannot pass posted writes.

--
Justin
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