Module Name: src
Committed By: msaitoh
Date: Thu Aug 9 04:16:37 UTC 2012
Modified Files:
src/sys/dev/pci: if_wm.c
Log Message:
Add workaround for QEMU and the variants.
This problem was discovered a few years ago, but some variants and
cloud services still have the bug. This problem is not NetBSD's bug
but qemus's bug. For NetBSD users, existence of buggy virtual machines
s sad thing, so we add a workaroud.
To generate a diff of this commit:
cvs rdiff -u -r1.229 -r1.230 src/sys/dev/pci/if_wm.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/pci/if_wm.c
diff -u src/sys/dev/pci/if_wm.c:1.229 src/sys/dev/pci/if_wm.c:1.230
--- src/sys/dev/pci/if_wm.c:1.229 Sun Jul 22 14:33:04 2012
+++ src/sys/dev/pci/if_wm.c Thu Aug 9 04:16:37 2012
@@ -1,4 +1,4 @@
-/* $NetBSD: if_wm.c,v 1.229 2012/07/22 14:33:04 matt Exp $ */
+/* $NetBSD: if_wm.c,v 1.230 2012/08/09 04:16:37 msaitoh Exp $ */
/*
* Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -76,7 +76,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.229 2012/07/22 14:33:04 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.230 2012/08/09 04:16:37 msaitoh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -4628,6 +4628,22 @@ wm_read_eeprom_uwire(struct wm_softc *sc
reg = CSR_READ(sc, WMREG_EECD) & ~(EECD_SK | EECD_DI);
CSR_WRITE(sc, WMREG_EECD, reg);
+ /*
+ * XXX: workaround for a bug in qemu-0.12.x and prior
+ * and Xen.
+ *
+ * We use this workaround only for 82540 because qemu's
+ * e1000 act as 82540.
+ */
+ if (sc->sc_type >= WM_T_82540) {
+ reg |= EECD_SK;
+ CSR_WRITE(sc, WMREG_EECD, reg);
+ reg &= ~EECD_SK;
+ CSR_WRITE(sc, WMREG_EECD, reg);
+ delay(2);
+ }
+ /* XXX: end of workaround */
+
/* Set CHIP SELECT. */
reg |= EECD_CS;
CSR_WRITE(sc, WMREG_EECD, reg);
