Date: Wed, 27 Jan 1999 00:52:18 -0500 (EST) From: Simon Shapiro <shimon@simon-shapiro.org> To: freebsd-alpha@FreeBSD.ORG, Mark Salyzyn <salyzyn_mark@dpt.com> Subject: Alpha/PCI Help Request Message-ID: <XFMail.990127005218.shimon@simon-shapiro.org>
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Hi Y'll
As promissed, I am here again seeking free advise and cheap thrills (well,
free advise for sure :-).
I can now talk to the DPT card, but there are some problems:
* The PCI code has changed quite a bit since I wrote the driver. the
existing PCI code was written by the CAM team, so I am not up to speed
yet :-(
* The PCI probe banner announces that the card is on int a, irq 0. this
does not look good to me. I have no idea how to set the IRQ, other than
what is done already in the driver (sys/pci/dpt_pci.c, and
sys/dev/dpt/dpt_scsi.c)
* The driver, in the initialization routine (dpt_init), around line 1370
makes a call to bus_dma_tag_create().
* I have not studied this function yet, but the arguments passed to it are:
parent_dma_tag = 0xfffffe0001120a80
alignment = 0 /* hard-coded in the call */
boundry = 0 /* Hard-coded */
lowaddr = 0xffffffff /* BUS_SPACE_MAXADDR */
highaddr = 0xffffffff /* BUS_SPACE_MAXADDR */
filter = NULL /* hard-coded */
filterarg = NULL /* Hard-coded */
maxsize = 0x10000 /* MAXBSIZE */
nsegments = 1 /* dpt->sgsize setup above */
maxsegsz = 0x20 /* BUS_SPACE_MAXSIZE_32BIT */
flags = 2 /* BUS_DMA_ALLOCNOW */
buffer_dma_tag = 0xfffffe0001126010 /* dpt->buffer_dmat */
* The system abort booting at this point, dropping back to the SRM which
says:
halted CPU 0
halt code = 7
machine check while in PAL mode
PC = 18400
boot failure
>>>
* Obviously the driver works under IA (i386), or I could not type this
message :-)
If this rings a bell, please let me know. I will try, in the meantime to
isolate the exact line of code that blows up (1C resolution), and post some
more information.
Sincerely Yours, Shimon@Simon-Shapiro.ORG
770.265.7340
Simon Shapiro
Unwritten code has no bugs and executes at twice the speed of mouth
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