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authorLinus Torvalds <torvalds@linux-foundation.org>2009-10-02 16:20:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-02 16:20:43 -0700
commita037a79dceaf717409fbf42f4ad209b9c15f435c (patch)
treec30b5b033c74ab9470e875554bded16464bbdf9b /Documentation
parent90d5ffc729e92bffc0f84e2447e2e6dc280240a5 (diff)
parentd25ef8b86e6a58f5476bf6e4a8da730b335f68fa (diff)
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Merge master.kernel.org:/home/rmk/linux-2.6-arm
* master.kernel.org:/home/rmk/linux-2.6-arm: (25 commits) ARM: 5728/1: Proper prefetch abort handling on ARMv6 and ARMv7 ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() ARM: 5740/1: fix valid_phys_addr_range() range check ARM: 5739/1: ARM: allow empty ATAG_CORE ARM: 5735/1: sa1111: CodingStyle cleanups ARM: 5738/1: Correct TCM documentation ARM: 5734/1: arm: fix compilation of entry-common.S for older CPUs ARM: 5733/1: fix bcmring compile error ARM: 5732/1: remove redundant include file ARM: 5731/2: Fix U300 generic GPIO, remove ifdefs from MMCI v3 ARM: Ensure do_cache_op takes mmap_sem ARM: Fix __cpuexit section mismatch warnings ARM: Don't allow highmem on SMP platforms without h/w TLB ops broadcast ARM: includecheck fix: mach-davinci, board-dm365-evm.c ARM: Remove unused CONFIG SA1100_H3XXX ARM: Fix warning: unused variable 'highmem' ARM: Fix warning: #warning syscall migrate_pages not implemented ARM: Fix SA11x0 clocksource warning ARM: Fix SA1100 Neponset serial section mismatch ARM: Fix SA1100 Assabet/Neponset PCMCIA section mismatch warnings ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/arm/tcm.txt10
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/arm/tcm.txt b/Documentation/arm/tcm.txt
index 074f4be6667..77fd9376e6d 100644
--- a/Documentation/arm/tcm.txt
+++ b/Documentation/arm/tcm.txt
@@ -29,11 +29,13 @@ TCM location and size. Notice that this is not a MMU table: you
actually move the physical location of the TCM around. At the
place you put it, it will mask any underlying RAM from the
CPU so it is usually wise not to overlap any physical RAM with
-the TCM. The TCM memory exists totally outside the MMU and will
-override any MMU mappings.
+the TCM.
-Code executing inside the ITCM does not "see" any MMU mappings
-and e.g. register accesses must be made to physical addresses.
+The TCM memory can then be remapped to another address again using
+the MMU, but notice that the TCM if often used in situations where
+the MMU is turned off. To avoid confusion the current Linux
+implementation will map the TCM 1 to 1 from physical to virtual
+memory in the location specified by the machine.
TCM is used for a few things: