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Code Issues Releases Activity

Replace an outb() during the test for configuration mechanism #1 with a

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DELAY(1) instead.  After wading through old commit logs, I found that the
outb() was added not as part of the test but as an intentional delay. In
fact, according to Shanley's PCI book, the configuration 1 data and address
ports should only be accessed using aligned 32-bit accesses (i.e. inl()
and outl()).  Thus, using outb() to just the last byte of the port violates
the PCI spec it would seem.  On at least one box doing so broke the probe
for PCI, whereas changing it to a DELAY(1) fixed the probe.

Reported by:	Sean Welch <welchsm@earthlink.net>
MFC after:	1 week
This commit is contained in:
John Baldwin 2003-12-31 16:56:32 +00:00
parent ae59481b1a
commit 21e25fa607
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=124021
2 changed files with 2 additions and 2 deletions
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2
sys/i386/pci/pci_cfgreg.c
View File

@ -732,7 +732,7 @@ pcireg_cfgopen(void)
devmax = 32;
outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
outb(CONF1_ADDR_PORT + 3, 0);
DELAY(1);
mode1res = inl(CONF1_ADDR_PORT);
outl(CONF1_ADDR_PORT, oldval1);

2
sys/i386/pci/pci_pir.c
View File

@ -732,7 +732,7 @@ pcireg_cfgopen(void)
devmax = 32;
outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
outb(CONF1_ADDR_PORT + 3, 0);
DELAY(1);
mode1res = inl(CONF1_ADDR_PORT);
outl(CONF1_ADDR_PORT, oldval1);