diff options
Diffstat (limited to 'recipes/linux/linux-2.6.18/mtd-unlock-nor-flash-automatically-where-necessary.patch')
| -rw-r--r-- | recipes/linux/linux-2.6.18/mtd-unlock-nor-flash-automatically-where-necessary.patch | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/recipes/linux/linux-2.6.18/mtd-unlock-nor-flash-automatically-where-necessary.patch b/recipes/linux/linux-2.6.18/mtd-unlock-nor-flash-automatically-where-necessary.patch new file mode 100644 index 0000000000..1cb1f8e6d3 --- /dev/null +++ b/recipes/linux/linux-2.6.18/mtd-unlock-nor-flash-automatically-where-necessary.patch @@ -0,0 +1,75 @@ +From 187ef15268e638603dea55a91fdfa29feaed6d13 Mon Sep 17 00:00:00 2001 +From: =?utf-8?q?H=C3=A5vard_Skinnemoen?= <hskinnemoen@atmel.com> +Date: Fri, 22 Sep 2006 10:07:08 +0100 +Subject: [PATCH] [MTD] Unlock NOR flash automatically where necessary +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Introduce the MTD_STUPID_LOCK flag which indicates that the flash chip is +always locked after power-up, so all sectors need to be unlocked before it +is usable. + +If this flag is set, and the chip provides an unlock() operation, +mtd_add_device will unlock the whole MTD device if it's writeable. This +means that non-writeable partitions will stay locked. + +Set MTD_STUPID_LOCK in fixup_use_atmel_lock() so that these chips will work +as expected. + +Signed-off-by: Håvard Skinnemoen <hskinnemoen@atmel.com> +Signed-off-by: Andrew Morton <akpm@osdl.org> +Signed-off-by: David Woodhouse <dwmw2@infradead.org> +--- + drivers/mtd/chips/cfi_cmdset_0002.c | 1 + + drivers/mtd/mtdcore.c | 10 ++++++++++ + include/mtd/mtd-abi.h | 1 + + 3 files changed, 12 insertions(+), 0 deletions(-) + +diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c +index a482e89..702ae4c 100644 +--- a/drivers/mtd/chips/cfi_cmdset_0002.c ++++ b/drivers/mtd/chips/cfi_cmdset_0002.c +@@ -212,6 +212,7 @@ static void fixup_use_atmel_lock(struct mtd_info *mtd, void *param) + { + mtd->lock = cfi_atmel_lock; + mtd->unlock = cfi_atmel_unlock; ++ mtd->flags |= MTD_STUPID_LOCK; + } + + static struct cfi_fixup cfi_fixup_table[] = { +diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c +index 168d3ba..c4d26de 100644 +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -57,6 +57,16 @@ int add_mtd_device(struct mtd_info *mtd) + mtd->index = i; + mtd->usecount = 0; + ++ /* Some chips always power up locked. Unlock them now */ ++ if ((mtd->flags & MTD_WRITEABLE) ++ && (mtd->flags & MTD_STUPID_LOCK) && mtd->unlock) { ++ if (mtd->unlock(mtd, 0, mtd->size)) ++ printk(KERN_WARNING ++ "%s: unlock failed, " ++ "writes may not work\n", ++ mtd->name); ++ } ++ + DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name); + /* No need to get a refcount on the module containing + the notifier, since we hold the mtd_table_mutex */ +diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h +index 1da3f7f..b0a67b7 100644 +--- a/include/mtd/mtd-abi.h ++++ b/include/mtd/mtd-abi.h +@@ -34,6 +34,7 @@ struct mtd_oob_buf { + #define MTD_WRITEABLE 0x400 /* Device is writeable */ + #define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */ + #define MTD_NO_ERASE 0x1000 /* No erase necessary */ ++#define MTD_STUPID_LOCK 0x2000 /* Always locked after reset */ + + // Some common devices / combinations of capabilities + #define MTD_CAP_ROM 0 +-- +1.4.4.1 + |