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Patch from Emmanuel Raguet <raguet@crf.canon.fr>:

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I have made test with the Dec21140 driver and it appears that all
    works fine even if the cache is enabled for the memory space in
    which the incoming and outcoming Ethernet frames are stored.

    I have had #ifdef to "comment" the code. If you want to disable
    cache, you only have to #define the name. It could be mandatory
    for some BSPs.
This commit is contained in:
Joel Sherrill
1999-04-28 13:59:11 +00:00
parent cfcb5a299a
commit 8846bbd0ec
1 changed files with 3 additions and 1 deletions
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4
c/src/lib/libbsp/i386/pc386/dec21140/dec21140.c
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@@ -406,12 +406,14 @@ dec21140Enet_initialize_hardware (struct dec21140_softc *sc)
cp = (char *)malloc((NRXBUFS+NTXBUFS)*(sizeof(struct MD)+ RBUF_SIZE) + PG_SIZE);
sc->bufferBase = cp;
cp += (PG_SIZE - (int)cp) & MASK_OFFSET ;
cp += (PG_SIZE - (int)cp) & MASK_OFFSET;
#ifdef PCI_BRIDGE_DOES_NOT_ENSURE_CACHE_COHERENCY_FOR_DMA
if (_CPU_is_paging_enabled())
_CPU_change_memory_mapping_attribute
(NULL, cp,
(NRXBUFS+NTXBUFS)*(sizeof(struct MD)+ RBUF_SIZE),
PTE_CACHE_DISABLE | PTE_WRITABLE);
#endif
rmd = (struct MD*)cp;
sc->MDbase = rmd;
buffer = cp + ((NRXBUFS+NTXBUFS)*sizeof(struct MD));