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Hmm- seriously funny and sad bug: you need to directly establish the

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clock rate for this board on Alpha/PCI systems. Under x86/PCI, the
board f/w will correctly tell you "I'm running at 60Mhz", so the code
that preserved that across a board reset (which would drop the chip
back to 40Mhz) worked fine. On the 8200, the chip was saying "I'm 40Mhz"-
which wasn't true. This turned out to be okay as long as you didn't have
any FAST or UltraFast targets- In fact, setting the chip to 40Mhz allowed
you to run up to 8Mhz SCSI. Unfortunately you die bigtime on the devices
that go faster than that. The fix here is to only use what the chip tells
you the clock rate is in the cases you don't really know (sbus is the
only case where this could be different, although with 66Mhz PCI coming up,
this may change).
This commit is contained in:
mjacob 1997-06-22 19:57:06 +00:00
parent 796badce6b
commit 68d184dc19
1 changed files with 18 additions and 14 deletions
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32
sys/dev/ic/isp.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: isp.c,v 1.7 1997/06/08 06:31:52 thorpej Exp $ */
/* $NetBSD: isp.c,v 1.8 1997/06/22 19:57:06 mjacob Exp $ */
/*
* Machine Independent (well, as best as possible)
@ -99,7 +99,7 @@ isp_reset(isp)
{
mbreg_t mbs;
int loops, i;
u_int8_t oldclock;
u_int8_t clock;
isp->isp_state = ISP_NILSTATE;
/*
@ -109,16 +109,22 @@ isp_reset(isp)
/*
* Try and get old clock rate out before we hit the
* chip over the head.
* chip over the head- but if and only if we don't
* know our desired clock rate.
*/
mbs.param[0] = MBOX_GET_CLOCK_RATE;
(void) isp_mboxcmd(isp, &mbs);
if (mbs.param[0] == MBOX_COMMAND_COMPLETE) {
oldclock = mbs.param[1];
} else {
oldclock = 0;
clock = isp->isp_mdvec->dv_clock;
if (clock == 0) {
mbs.param[0] = MBOX_GET_CLOCK_RATE;
(void) isp_mboxcmd(isp, &mbs);
if (mbs.param[0] == MBOX_COMMAND_COMPLETE) {
clock = mbs.param[1];
printf("%s: using board clock 0x%x\n",
isp->isp_name, clock);
} else {
clock = 0;
}
}
/*
* Hit the chip over the head with hammer.
*/
@ -270,11 +276,9 @@ isp_reset(isp)
/*
* Set CLOCK RATE
*/
if (isp->isp_mdvec->dv_clock || oldclock) {
u_int8_t save;
if (clock) {
mbs.param[0] = MBOX_SET_CLOCK_RATE;
save = mbs.param[1] =
(oldclock)? oldclock : isp->isp_mdvec->dv_clock;
mbs.param[1] = clock;
(void) isp_mboxcmd(isp, &mbs);
if (mbs.param[0] != MBOX_COMMAND_COMPLETE) {
printf("%s: failed to set CLOCKRATE\n", isp->isp_name);