Dinesh Nair wrote:
On 10/27/05 04:16 Scott Long said the following:
an example would be using
(BUS_DMASYNC_POSTREAD|BUS_DMASYNC_PREWRITE) which
would be 0x03 in freebsd 4.x and 0x06 in freebsd 5.x. the gotcha is
that
0x03 in freebsd 4.x is BUS_DMASYNC_POSTWRITE. so therefore,
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_PREWRITE will be
BUS_DMASYNC_POSTWRITE in
4.x which in the syscall is actually a no op.
Yes, that is fugly. Just don't use the | versions for now I would
guess.
Trying to maintain source compatibility between 4.x and 5.x/6.x will
make you encounter a whole lot more problems than just this.
could you elaborate on what busdma related problems there'd be, between
4.x and 5.x/6.x ? do, for example, the inner workings of the bus_dma*
syscalls work the same on both ?
I was speaking about driver code in general. For busdma specifically,
the only difference is the extra arguments to bus_dma_tag_create().
Scott
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