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authorjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2011-12-13 20:41:22 +0000
committerjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2011-12-13 20:41:22 +0000
commit05535c276603ee7af4d8ce66a314b96bf32086d3 (patch)
tree369281011018133764e0cd8c8c6430b1a1a8b0d9 /target/linux/generic/patches-3.0/476-mtd-m25p80-allow-to-disable-small-sector-erase.patch
parentbc53008b155b6a834c2a617de91332b6e113a2c3 (diff)
generic: disable 'small sector' erase in m25p80 driver
This fixes the issues with the jffs2 images on various boards. Using JFFS2 on devices with 4KiB erase sectors is not safe: http://lists.infradead.org/pipermail/linux-mtd/2011-June/036591.html git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29521 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/generic/patches-3.0/476-mtd-m25p80-allow-to-disable-small-sector-erase.patch')
-rw-r--r--target/linux/generic/patches-3.0/476-mtd-m25p80-allow-to-disable-small-sector-erase.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.0/476-mtd-m25p80-allow-to-disable-small-sector-erase.patch b/target/linux/generic/patches-3.0/476-mtd-m25p80-allow-to-disable-small-sector-erase.patch
new file mode 100644
index 0000000000..cc78d91f63
--- /dev/null
+++ b/target/linux/generic/patches-3.0/476-mtd-m25p80-allow-to-disable-small-sector-erase.patch
@@ -0,0 +1,41 @@
+--- a/drivers/mtd/devices/Kconfig
++++ b/drivers/mtd/devices/Kconfig
+@@ -102,6 +102,14 @@ config M25PXX_USE_FAST_READ
+ help
+ This option enables FAST_READ access supported by ST M25Pxx.
+
++config M25PXX_PREFER_SMALL_SECTOR_ERASE
++ bool "Prefer small sector erase"
++ depends on MTD_M25P80
++ default y
++ help
++ This option enables use of the small erase sectors if that is
++ supported by the flash chip.
++
+ config MTD_SST25L
+ tristate "Support SST25L (non JEDEC) SPI Flash chips"
+ depends on SPI_MASTER
+--- a/drivers/mtd/devices/m25p80.c
++++ b/drivers/mtd/devices/m25p80.c
+@@ -83,6 +83,12 @@
+
+ #define JEDEC_MFR(_jedec_id) ((_jedec_id) >> 16)
+
++#ifdef CONFIG_M25PXX_PREFER_SMALL_SECTOR_ERASE
++#define PREFER_SMALL_SECTOR_ERASE 1
++#else
++#define PREFER_SMALL_SECTOR_ERASE 0
++#endif
++
+ /****************************************************************************/
+
+ struct m25p {
+@@ -924,7 +930,7 @@ static int __devinit m25p_probe(struct s
+ flash->mtd.write = m25p80_write;
+
+ /* prefer "small sector" erase if possible */
+- if (info->flags & SECT_4K) {
++ if (PREFER_SMALL_SECTOR_ERASE && (info->flags & SECT_4K)) {
+ flash->erase_opcode = OPCODE_BE_4K;
+ flash->mtd.erasesize = 4096;
+ } else if (info->flags & SECT_4K_PMC) {