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bcm53xx: hack UBI to erase all dirty blocks left by CFE

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UBI requires PEBs to be formatted (with a valid UBI header) or empty
(0xFF), however CFE doesn't clear blocks after flashing the image. To
workaround this problem, teach UBI to recognize EOF mark in a similar
way JFFS2 handles that in OpenWrt.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 42940
This commit is contained in:
Rafał Miłecki 2014-10-16 20:52:22 +00:00
parent 1ffe299eab
commit 150c200e91
1 changed files with 39 additions and 0 deletions
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39
target/linux/bcm53xx/patches-3.14/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch Normal file
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@ -0,0 +1,39 @@
From f41f8b42db092e505382f7120994de21590dff48 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Thu, 16 Oct 2014 20:52:16 +0200
Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
drivers/mtd/ubi/io.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index d361349..f9bba3c 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -727,6 +727,7 @@ bad:
* o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty)
* o a negative error code in case of failure.
*/
+static bool erase_all_next = false;
int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
struct ubi_ec_hdr *ec_hdr, int verbose)
{
@@ -753,6 +754,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
}
magic = be32_to_cpu(ec_hdr->magic);
+ if (magic == 0xdeadc0de)
+ erase_all_next = true;
+ if (erase_all_next)
+ return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
if (magic != UBI_EC_HDR_MAGIC) {
if (mtd_is_eccerr(read_err))
return UBI_IO_BAD_HDR_EBADMSG;
--
1.8.4.5