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| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2021-01-10 20:44:58 +0100 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2021-01-10 20:44:58 +0100 |
| commit | 069d27ba1d95fa2cf08cf483f8e03cbff1bb59ae (patch) | |
| tree | a9d556c6d214c1a330f6c24f4c46fe9a814de1ba | |
| parent | 76ed42e31ff3297f1ca9b144ccc9466b0074f92b (diff) | |
| download | plan9front-069d27ba1d95fa2cf08cf483f8e03cbff1bb59ae.tar.xz | |
pc, pc64: revert addition of pcireset() call to pcicfginit()
Revert the change, as it causes system lockups on bootup
on some systems with USB OHCI controllers, suspected to be
caused by BIOS/SMM accessing the device as BIOS handover
has not been executed yet.
We might bring that back when the problem has is better
understood.
| -rw-r--r-- | sys/src/9/pc/pcipc.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sys/src/9/pc/pcipc.c b/sys/src/9/pc/pcipc.c index 412862b32..3355e7b0c 100644 --- a/sys/src/9/pc/pcipc.c +++ b/sys/src/9/pc/pcipc.c @@ -716,7 +716,15 @@ pcicfginit(void) if(pciroot == nil) goto out; - pcireset(); + /* + * Disabling devices here (by clearing bus master enable) + * causes problems with with some OHCI USB controllers. + * I supected that this is due to legacy device emulation + * and revoking bus master flag before executing the handoff + * makes BIOS/SMM lock up the system. + * + * pcireset(); + */ if(nobios) { uvlong mema; |