Hi. I reported to remove pit_latch_buggy(http://lkml.org/lkml/2007/2/10/8).
In the report, I stated that TSC was unstable.
When I installed 2.6.21, GeodeGX's TSC is stable.
It was fixed by http://bugzilla.kernel.org/show_bug.cgi?id=8027 and follow:
commit 6b3964cde70cfe6db79d35b42137431ef7d2f7e4
Author: Thomas Gleixner <[email protected]>
Date: Thu Mar 22 22:46:18 2007 +0100
[PATCH] i386: clockevents fix breakage on Geode/Cyrix PIT implementations
In 2.6.22, marks unstable GeodeGX's TSC. However, it is not necessary to
mark TSC is unstable.
Signed-off-by: TAKADA Yoshihito <[email protected]>
diff -Narup a/arch/i386/kernel/cpu/cyrix.c b/arch/i386/kernel/cpu/cyrix.c
--- a/arch/i386/kernel/cpu/cyrix.c 2007-07-15 16:55:29.000000000 +0900
+++ b/arch/i386/kernel/cpu/cyrix.c 2007-07-15 20:21:11.000000000 +0900
@@ -6,7 +6,6 @@
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/timer.h>
-#include <asm/pci-direct.h>
#include <asm/tsc.h>
#include "cpu.h"
@@ -252,8 +251,6 @@ static void __cpuinit init_cyrix(struct
case 4: /* MediaGX/GXm or Geode GXM/GXLV/GX1 */
#ifdef CONFIG_PCI
- {
- u32 vendor, device;
/* It isn't really a PCI quirk directly, but the cure is the
same. The MediaGX has deep magic SMM stuff that handles the
SB emulation. It thows away the fifo on disable_dma() which
@@ -268,21 +265,6 @@ static void __cpuinit init_cyrix(struct
printk(KERN_INFO "Working around Cyrix MediaGX virtual DMA bugs.\n");
isa_dma_bridge_buggy = 2;
-
- /* We do this before the PCI layer is running. However we
- are safe here as we know the bridge must be a Cyrix
- companion and must be present */
- vendor = read_pci_config_16(0, 0, 0x12, PCI_VENDOR_ID);
- device = read_pci_config_16(0, 0, 0x12, PCI_DEVICE_ID);
-
- /*
- * The 5510/5520 companion chips have a funky PIT.
- */
- if (vendor == PCI_VENDOR_ID_CYRIX &&
- (device == PCI_DEVICE_ID_CYRIX_5510 || device == PCI_DEVICE_ID_CYRIX_5520))
- /*mark_tsc_unstable("cyrix 5510/5520 detected");*/
- printk("cyrix 5510/5520 detected\n");
- }
#endif
c->x86_cache_size=16; /* Yep 16K integrated cache thats it */
-
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