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uboot-mediatek: add support for UBI EOF marker

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Let U-Boot handle free space in UBI partitions by recognizing the EOF
marker OpenWrt is using as well for that purpose.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2022-07-13 04:30:00 +01:00
parent 9f1d622328
commit 7659ee1e27
1 changed files with 51 additions and 0 deletions
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51
package/boot/uboot-mediatek/patches/600-ubi-detect-eof-marker.patch Normal file
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@ -0,0 +1,51 @@
--- a/drivers/mtd/ubi/attach.c 2022-07-11 14:42:58.000000000 +0100
+++ b/drivers/mtd/ubi/attach.c 2022-06-12 16:04:56.623658788 +0100
@@ -802,6 +802,13 @@
return err;
}
+static bool ec_hdr_has_eof(struct ubi_ec_hdr *ech)
+{
+ return ech->padding1[0] == 'E' &&
+ ech->padding1[1] == 'O' &&
+ ech->padding1[2] == 'F';
+}
+
/**
* scan_peb - scan and process UBI headers of a PEB.
* @ubi: UBI device description object
@@ -832,9 +839,21 @@
return 0;
}
- err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
- if (err < 0)
- return err;
+ if (!ai->eof_found) {
+ err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+ if (err < 0)
+ return err;
+
+ if (ec_hdr_has_eof(ech)) {
+ pr_notice("UBI: EOF marker found, PEBs from %d will be erased\n",
+ pnum);
+ ai->eof_found = true;
+ }
+ }
+
+ if (ai->eof_found)
+ err = UBI_IO_FF_BITFLIPS;
+
switch (err) {
case 0:
break;
--- a/drivers/mtd/ubi/ubi.h 2022-07-11 14:42:58.000000000 +0100
+++ b/drivers/mtd/ubi/ubi.h 2022-06-12 16:04:56.626992171 +0100
@@ -745,6 +745,7 @@
int mean_ec;
uint64_t ec_sum;
int ec_count;
+ bool eof_found;
struct kmem_cache *aeb_slab_cache;
};