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[PATCH] m68knommu: auto detect memory size on M5208EVB board 

Here is a small patch to automatically detect the DRAM size on m520x.
It was generated against 2.6.17-uc0, and tested on an Intec 5208 dev board.

Signed-off-by: Michael Broughton <mbobowik@telusplanet.net>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Michael Broughton 2006-12-04 17:27:29 +10:00 committed by Linus Torvalds
parent 1bddcc50c2
commit 5529840509
1 changed files with 20 additions and 0 deletions
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20
arch/m68knommu/platform/5307/head.S
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@ -64,6 +64,26 @@
negl %d0 /* negate bits */
.endm
#elif defined(CONFIG_M520x)
.macro GET_MEM_SIZE
clrl %d0
movel MCF_MBAR+MCFSIM_SDCS0, %d2 /* Get SDRAM chip select 0 config */
andl #0x1f, %d2 /* Get only the chip select size */
beq 3f /* Check if it is enabled */
addql #1, %d2 /* Form exponent */
moveql #1, %d0
lsll %d2, %d0 /* 2 ^ exponent */
3:
movel MCF_MBAR+MCFSIM_SDCS1, %d2 /* Get SDRAM chip select 1 config */
andl #0x1f, %d2 /* Get only the chip select size */
beq 4f /* Check if it is enabled */
addql #1, %d2 /* Form exponent */
moveql #1, %d1
lsll %d2, %d1 /* 2 ^ exponent */
addl %d1, %d0 /* Total size of SDRAM in d0 */
4:
.endm
#else
#error "ERROR: I don't know how to probe your boards memory size?"
#endif