From 552984050958fc0f51bff38948d0bf4d31ea2b03 Mon Sep 17 00:00:00 2001 From: Michael Broughton Date: Mon, 4 Dec 2006 17:27:29 +1000 Subject: [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 Signed-off-by: Greg Ungerer Signed-off-by: Linus Torvalds --- arch/m68knommu/platform/5307/head.S | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'arch/m68knommu/platform') diff --git a/arch/m68knommu/platform/5307/head.S b/arch/m68knommu/platform/5307/head.S index f2edb6498cd..b9aa0ca29bf 100644 --- a/arch/m68knommu/platform/5307/head.S +++ b/arch/m68knommu/platform/5307/head.S @@ -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 -- cgit v1.2.3