linux-kernel - [PATCH] powerpc 4xx: DDR0_14[REDUC] decoded incorrectly

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Date:	Mon, 09 Mar 2009 18:21:36 +0200
From:	Mikhail Zolotaryov <lebon@...on.org.ua>
To:	linux-kernel@...r.kernel.org
CC:	linuxppc-dev@...abs.org, jwboyer@...ux.vnet.ibm.com
Subject: [PATCH] powerpc 4xx: DDR0_14[REDUC] decoded incorrectly

Hi,

according to the PPC440EPx Embedded Processor User Manual (rev 1.14) 
DDR0_14[REDUC] bit has the following meaning:

REDUC - Enable the half data path feature of the controller
0 = Standard operation using full 64/72-bit memory bus
1 = Memory data path width is 32/40 bits

However, "1" is decoded as 64 bit (8 byte), "0" - as 32 bit (4 byte) bus 
by the kernel code. My understanding is this is not correct - patch 
attached.



View attachment "patch-ibm4xx_denali_fixup_memsize.patch" of type "text/plain" (412 bytes)