Messages in this thread | | | From | "David L. Oppenheimer" <> | Date | Sun, 27 Apr 1997 13:17:09 -0400 | Subject | EISA and ISA for SCSI DMA |
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From what I've read, ISA SCSI cards can do DMA only into memory addresses < 16 MB, while EISA SCSI cards do not have this restriction. In Linux 2.0.24, file drivers/scsi/sd.h, ISA_DMA_THRESHOLD is #defined to 16 MB, and this is used in sd.c, which makes it apply to _all_ SCSI cards, including non-ISA cards.
Why is this? Or am I missing something here?
Thanks for any information.
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