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authorStefan Roese <sr@denx.de>2007-11-20 21:19:16 +1100
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2007-12-23 13:31:16 -0600
commitf4151b9ba87901eb3a7bc49f418cc352d4e1927e (patch)
tree7481891935cea47d7794e583a6fdfe530575c17d /include/asm-ppc
parent4922566f0394ac41c72fb960f22b4f84333026bc (diff)
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[POWERPC] 4xx: Fix TLB 0 problem with CONFIG_SERIAL_TEXT_DEBUG
Right now TLB entry 0 ist used as UART0 mapping for the early debug output (via CONFIG_SERIAL_TEXT_DEBUG). This causes problems when many TLB's get used upon Linux bootup (e.g. while PCIe scanning behind bridges and/or switches on 440SPe platforms). This will overwrite the TLB 0 entry and further debug output's may crash/hang the system. This patch moves the early debug UART0 TLB entry from 0 to 62 as done in arch/powerpc. This way it is in the "pinned" area and will not get overwritten. Also the arch/ppc/mm/44x_mmu.c code is now synced with the newer code from arch/powerpc. Signed-off-by: Stefan Roese <sr@denx.de> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'include/asm-ppc')
-rw-r--r--include/asm-ppc/mmu.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-ppc/mmu.h b/include/asm-ppc/mmu.h
index 14584e505ed..d46b57b589a 100644
--- a/include/asm-ppc/mmu.h
+++ b/include/asm-ppc/mmu.h
@@ -383,6 +383,12 @@ typedef struct _P601_BAT {
#define BOOKE_PAGESZ_256GB 14
#define BOOKE_PAGESZ_1TB 15
+#ifndef CONFIG_SERIAL_TEXT_DEBUG
+#define PPC44x_EARLY_TLBS 1
+#else
+#define PPC44x_EARLY_TLBS 2
+#endif
+
/*
* Freescale Book-E MMU support
*/