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Commit 55298405 authored by Michael Broughton's avatar Michael Broughton Committed by Linus Torvalds
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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: default avatarMichael Broughton <mbobowik@telusplanet.net>
Signed-off-by: default avatarGreg Ungerer <gerg@uclinux.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1bddcc50

arch/m68knommu/platform/5307/head.S

+20 −0
Original line number Diff line number Diff line
@@ -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