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| author | Stefan Roese <sr@denx.de> | 2007-11-20 21:19:16 +1100 |
|---|---|---|
| committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2007-12-23 13:31:16 -0600 |
| commit | f4151b9ba87901eb3a7bc49f418cc352d4e1927e (patch) | |
| tree | 7481891935cea47d7794e583a6fdfe530575c17d /arch/ppc/kernel/head_44x.S | |
| parent | 4922566f0394ac41c72fb960f22b4f84333026bc (diff) | |
| download | blackbird-op-linux-f4151b9ba87901eb3a7bc49f418cc352d4e1927e.tar.gz blackbird-op-linux-f4151b9ba87901eb3a7bc49f418cc352d4e1927e.zip | |
[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 'arch/ppc/kernel/head_44x.S')
| -rw-r--r-- | arch/ppc/kernel/head_44x.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/ppc/kernel/head_44x.S b/arch/ppc/kernel/head_44x.S index 75bbc937ed73..ebb5a403829f 100644 --- a/arch/ppc/kernel/head_44x.S +++ b/arch/ppc/kernel/head_44x.S @@ -195,7 +195,7 @@ skpinv: addi r4,r4,1 /* Increment */ li r5,0 ori r5,r5,(PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_I | PPC44x_TLB_G) - li r0,0 /* TLB slot 0 */ + li r0,62 /* TLB slot 62 */ tlbwe r3,r0,PPC44x_TLB_PAGEID /* Load the pageid fields */ tlbwe r4,r0,PPC44x_TLB_XLAT /* Load the translation fields */ |
