uboot-mediatek: additions from MTK SDK

 * updated SNAND/SNFI driver brings support for MT7981
 * add support for MediaTek NAND Memory bad Block Management (NMBM)
   (not used for any boards atm, but could be useful in future)
 * wire up NMBM support for MT7622, MT7629, MT7981 and MT7986
 * replace some local patches with updated version from SDK
 * bring some legacy precompiler symbols which haven't been converted
   into Kconfig symbols in U-Boot 2022.07, remove when bumbping to
   U-Boot 2022.10:
   100-28-include-configs-mt7986-h-from-SDK.patch

Source: https://github.com/mtk-openwrt/u-boot
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/package/boot/uboot-mediatek/patches/100-27-mtd-ubi-add-support-for-UBI-end-of-filesystem-marker.patch b/package/boot/uboot-mediatek/patches/100-27-mtd-ubi-add-support-for-UBI-end-of-filesystem-marker.patch
new file mode 100644
index 0000000000..cd1794f0d1
--- /dev/null
+++ b/package/boot/uboot-mediatek/patches/100-27-mtd-ubi-add-support-for-UBI-end-of-filesystem-marker.patch
@@ -0,0 +1,66 @@
+From 189a2fe96931ef3ea0e187c8e9bfa589c2a0ae10 Mon Sep 17 00:00:00 2001
+From: Weijie Gao <weijie.gao@mediatek.com>
+Date: Mon, 25 Jul 2022 17:24:56 +0800
+Subject: [PATCH 62/71] mtd: ubi: add support for UBI end-of-filesystem marker
+ used by OpenWrt
+
+Add support for UBI end-of-filesystem marker used by OpenWrt to allow
+attaching a new UBI mtd partition just upgraded.
+
+Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
+---
+ drivers/mtd/ubi/attach.c | 25 ++++++++++++++++++++++---
+ drivers/mtd/ubi/ubi.h    |  1 +
+ 2 files changed, 23 insertions(+), 3 deletions(-)
+
+--- a/drivers/mtd/ubi/attach.c
++++ b/drivers/mtd/ubi/attach.c
+@@ -802,6 +802,13 @@ out_unlock:
+ 	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 @@ static int scan_peb(struct ubi_device *u
+ 		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
++++ b/drivers/mtd/ubi/ubi.h
+@@ -745,6 +745,7 @@ struct ubi_attach_info {
+ 	int mean_ec;
+ 	uint64_t ec_sum;
+ 	int ec_count;
++	bool eof_found;
+ 	struct kmem_cache *aeb_slab_cache;
+ };
+