From: Paul Parsons <lost.distance@yahoo.com>
Date: Mon, 27 Feb 2012 01:17:19 +0000 (+0000)
Subject: pxa/hx4700: Correct StrataFlash block size discovery
X-Git-Tag: v3.4-rc1~88^2~11^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=11407e5713ad85f416705a1ba0daf490ffaeda42;p=pandora-kernel.git

pxa/hx4700: Correct StrataFlash block size discovery

The HP iPAQ hx4700 has 128Mb of flash provided by two Intel StrataFlash devices.
The hx4700 platform configuration defines a single 128Mb flash resource,
resulting in the MTD physmap-flash driver probing the first device only and
presuming the second device is identical:

physmap platform flash device: 08000000 at 00000000
physmap-flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000089 Chip ID 0x008816
physmap-flash: Found 2 x16 devices at 0x4000000 in 32-bit bank
<snip>
erase region 0: offset=0x0,size=0x10000,blocks=4
erase region 1: offset=0x40000,size=0x40000,blocks=255
erase region 2: offset=0x4000000,size=0x10000,blocks=4
erase region 3: offset=0x4040000,size=0x40000,blocks=255
physmap-flash: 2 set(s) of 2 interleaved chips --> 32 partitions of 4096 KiB

Unfortunately the two devices are not identical. The first has a device ID of
0x8816, identifying a bottom parameter device. The second has a device ID of
0x8813, identifying a top parameter device. By not probing the second device,
physmap-flash does not discover the correct block sizes.

This patch splits the configuration into two 64Mb flash resources, forcing
physmap-flash to probe both devices and thus discover the correct block sizes:

physmap platform flash device: 04000000 at 00000000
physmap-flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000089 Chip ID 0x008816
<snip>
erase region 0: offset=0x0,size=0x10000,blocks=4
erase region 1: offset=0x40000,size=0x40000,blocks=255
physmap-flash: 1 set(s) of 2 interleaved chips --> 16 partitions of 4096 KiB
physmap platform flash device: 04000000 at 04000000
physmap-flash: Found 2 x16 devices at 0x0 in 32-bit bank. Manufacturer ID 0x000089 Chip ID 0x008813
<snip>
erase region 0: offset=0x0,size=0x40000,blocks=255
erase region 1: offset=0x3fc0000,size=0x10000,blocks=4
physmap-flash: 1 set(s) of 2 interleaved chips --> 16 partitions of 4096 KiB
Concatenating MTD devices:
(0): "physmap-flash"
(1): "physmap-flash"
into device "physmap-flash"

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
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