Date: Tue, 06 Apr 1999 23:53:56 +1000 From: Stephen McKay <syssgm@detir.qld.gov.au> To: freebsd-current@freebsd.org Cc: syssgm@detir.qld.gov.au Subject: Slightly wonky auto memory probe + fix Message-ID: <199904061353.XAA19881@nymph.detir.qld.gov.au>
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[I posted this to -current because the technology is the same in -current
even though this box will never run -current. Bear with me.]
We've just got a new Dell PowerEdge (very nice) with 512MB of ram. By
default, 3.1-stable sees only 64MB. Looking carefully, it sees 8KB less
than 64MB, so it doesn't probe for the rest.
I applied this patch, which fiddles the "Hmm got 64MB so probe for the
rest" heuristic. With this patch, it found all 512MB, to the exact byte.
Unfortunately, it kinda changes it from a "heuristic" to a "hack". :-(
--- machdep.c Fri Feb 19 15:31:36 1999
+++ /tmp/sgm/machdep.c Tue Apr 6 23:40:36 1999
@@ -1428,7 +1428,7 @@
* the MAXMEM option or the npx0 "msize", then don't do the speculative
* memory probe.
*/
- if (Maxmem >= 0x4000)
+ if (Maxmem >= 0x3f00)
speculative_mprobe = TRUE;
else
speculative_mprobe = FALSE;
@@ -1538,7 +1538,7 @@
if (phys_avail[pa_indx] == target_page) {
phys_avail[pa_indx] += PAGE_SIZE;
if (speculative_mprobe == TRUE &&
- phys_avail[pa_indx] >= (64*1024*1024))
+ phys_avail[pa_indx] >= (63*1024*1024))
Maxmem++;
} else {
pa_indx++;
Stephen.
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