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ARM: 5738/1: Correct TCM documentation
It turns out that the TCM memory can be remap:ed by the MMU just
like any other memory.
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
authored by
Linus Walleij
and committed by
Russell King
610ea6c6
6176d394
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Documentation/arm/tcm.txt
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Documentation/arm/tcm.txt
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actually move the physical location of the TCM around. At the
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place you put it, it will mask any underlying RAM from the
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CPU so it is usually wise not to overlap any physical RAM with
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the TCM. The TCM memory exists totally outside the MMU and will
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override any MMU mappings.
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the TCM.
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Code executing inside the ITCM does not "see" any MMU mappings
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and e.g. register accesses must be made to physical addresses.
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The TCM memory can then be remapped to another address again using
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the MMU, but notice that the TCM if often used in situations where
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the MMU is turned off. To avoid confusion the current Linux
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implementation will map the TCM 1 to 1 from physical to virtual
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memory in the location specified by the machine.
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TCM is used for a few things:
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