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ARM: configs: at91: Remove MTD_BLOCK and use MTD_UBI_BLOCK for read only block FS
Using mtdblock on raw flashes is generally a bad idea as it lacks wear-leveling, bad block handling or power-cut management. What happens when you use mtdblock and you change any sector of your mtdblockX device, is that it reads the whole corresponding eraseblock into the memory, erases the eraseblock, changes the sector in RAM, and writes the whole eraseblock back. If you have a power failure when the eraseblock is being erased, you lose all the block device sectors in it. The flash will likely decay soon because the eraseblocks will wear out. Remove this archaic tool as its use case should rather be only for debug purposes. This means that write-capable block file systems like ext2, ext3, FAT, etc. will no longer be addressed with at91 defconfigs. For read only block filesystems like SquashFS, use MTD_UBI_BLOCK instead and benefit of UBI's bit-flip handling and wear-levelling. Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20220420134740.193563-1-tudor.ambarus@microchip.com
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2 changed files with 2 additions and 2 deletions
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@ -50,13 +50,13 @@ CONFIG_DEVTMPFS_MOUNT=y
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CONFIG_MTD=y
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CONFIG_MTD_TESTS=m
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CONFIG_MTD_CMDLINE_PARTS=y
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CONFIG_MTD_BLOCK=y
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CONFIG_MTD_DATAFLASH=y
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CONFIG_MTD_RAW_NAND=y
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CONFIG_MTD_NAND_ATMEL=y
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CONFIG_MTD_SPI_NOR=y
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CONFIG_MTD_UBI=y
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CONFIG_MTD_UBI_FASTMAP=y
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CONFIG_MTD_UBI_BLOCK=y
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CONFIG_BLK_DEV_LOOP=y
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CONFIG_BLK_DEV_RAM=y
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CONFIG_BLK_DEV_RAM_COUNT=4
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@ -57,13 +57,13 @@ CONFIG_DEVTMPFS_MOUNT=y
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CONFIG_MTD=y
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CONFIG_MTD_TESTS=m
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CONFIG_MTD_CMDLINE_PARTS=y
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CONFIG_MTD_BLOCK=y
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CONFIG_MTD_CFI=y
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CONFIG_MTD_RAW_NAND=y
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CONFIG_MTD_NAND_ATMEL=y
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CONFIG_MTD_SPI_NOR=y
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CONFIG_MTD_UBI=y
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CONFIG_MTD_UBI_FASTMAP=y
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CONFIG_MTD_UBI_BLOCK=y
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CONFIG_BLK_DEV_LOOP=y
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CONFIG_BLK_DEV_RAM=y
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CONFIG_BLK_DEV_RAM_COUNT=4
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