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bsp/csb336: Fix MMU _ttbl_base location to not overlap with exception vectors.

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The initial region (64 bytes) of SDRAM RTEMS image is remapped
to provide overlay of the initial/ROM exceptions table.
This area cannot be used for MMU mapping table. Different correctly
aligned block has to be used for MMU table. Remapping of SDRAM
(address 0x08200000) to address 0 is supported only on 1 MB block
granularity and that is why SDRAM_VEC area has to be 1 MB aligned too
but unused part of remapped region can be freely used for other
purposes (as MMU tables).

Signed-off-by: Pavel Pisa <ppisa@pikron.com>
This commit is contained in:
Pavel Pisa
2013-08-09 08:49:55 +02:00
committed by Sebastian Huber
parent ef3c17fb89
commit e4b16ea919
1 changed files with 4 additions and 3 deletions
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c/src/lib/libbsp/arm/csb336/startup/linkcmds
+4 -3
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@@ -1,9 +1,10 @@
MEMORY {
SDRAM_MMU : ORIGIN = 0x08200000, LENGTH = 16k
SDRAM : ORIGIN = 0x08204000, LENGTH = 30M - 16k
SDRAM_VEC : ORIGIN = 0x08200000, LENGTH = 16k
SDRAM_MMU : ORIGIN = 0x08204000, LENGTH = 16k
SDRAM : ORIGIN = 0x08208000, LENGTH = 30M - 32k
}
REGION_ALIAS ("REGION_START", SDRAM);
REGION_ALIAS ("REGION_START", SDRAM_VEC);
REGION_ALIAS ("REGION_VECTOR", SDRAM);
REGION_ALIAS ("REGION_TEXT", SDRAM);
REGION_ALIAS ("REGION_TEXT_LOAD", SDRAM);