uboot-mediatek: fix factory reset on UBI

Truncating a UBI volume using `ubi write 0x0 volname 0x0` results in
segfault on newer U-Boot. Write 1MB of 0s instead.

Signed-off-by: Daniel Golle <[email protected]>

package/boot/uboot-mediatek/patches/404-add-bananapi_bpi-r64_defconfigs.patch

@@ -643,7 +643,7 @@
 +boot_write_bl2=mtd erase bl2 && mtd write spi-nand0 $loadaddr 0x0 0x20000 && mtd write spi-nand0 $loadaddr 0x20000 0x20000 && mtd write spi-nand0 $loadaddr 0x40000 0x20000 && mtd write spi-nand0 $loadaddr 0x60000 0x20000
 +boot_write_fip=mtd erase fip && mtd write fip $loadaddr
 +check_ubi=ubi part ubi || run ubi_format
-+reset_factory=ubi part ubi ; ubi write 0x0 ubootenv 0x0 ; ubi write 0x0 ubootenv2 0x0 ; ubi remove rootfs_data
++reset_factory=mw $loadaddr 0x0 0x100000 ; ubi part ubi ; ubi write $loadaddr ubootenv 0x100000 ; ubi write $loadaddr ubootenv2 0x100000 ; ubi remove rootfs_data
 +ubi_format=ubi detach ; mtd erase ubi && ubi part ubi ; reset
 +ubi_prepare_rootfs=if ubi check rootfs_data ; then else if env exists rootfs_data_max ; then ubi create rootfs_data $rootfs_data_max dynamic || ubi create rootfs_data - dynamic ; else ubi create rootfs_data - dynamic ; fi ; fi
 +ubi_read_production=ubi read $loadaddr fit && iminfo $loadaddr && run ubi_prepare_rootfs

package/boot/uboot-mediatek/patches/410-add-linksys-e8450.patch

@@ -390,7 +390,7 @@
 +boot_write_bl2=mtd erase bl2 && mtd write spi-nand0 $loadaddr 0x0 0x20000 && mtd write spi-nand0 $loadaddr 0x20000 0x20000 && mtd write spi-nand0 $loadaddr 0x40000 0x20000 && mtd write spi-nand0 $loadaddr 0x60000 0x20000
 +boot_write_fip=mtd erase fip && mtd write fip $loadaddr
 +check_ubi=ubi part ubi || run ubi_format
-+reset_factory=ubi part ubi ; ubi write 0x0 ubootenv 0x0 ; ubi write 0x0 ubootenv2 0x0 ; ubi remove rootfs_data
++reset_factory=mw $loadaddr 0x0 0x100000 ; ubi part ubi ; ubi write $loadaddr ubootenv 0x100000 ; ubi write $loadaddr ubootenv2 0x100000 ; ubi remove rootfs_data
 +ubi_format=ubi detach ; mtd erase ubi && ubi part ubi ; reset
 +ubi_prepare_rootfs=if ubi check rootfs_data ; then else if env exists rootfs_data_max ; then ubi create rootfs_data $rootfs_data_max dynamic || ubi create rootfs_data - dynamic ; else ubi create rootfs_data - dynamic ; fi ; fi
 +ubi_read_production=ubi read $loadaddr fit && iminfo $loadaddr && run ubi_prepare_rootfs