While in U-boot in an arm based board (wb45n), I manually erase and then mark a block bad. U-Boot> nand erase 0x00720000 20000. NAND erase: device 0 offset 0x00720000, size 0x20000 Erasing at 0x720000 — 100% complete. OK U-Boot> nand markbad 0x00720000 block 0x00720000 successfully marked as bad U-Boot> nand bad > Device 0 bad blocks: 00720000, > in message you wrote: > > I am voting for David’s implementation, since bad blocks are normal > > on NAND chips. And if I remember correctly, the old U – Boot NAND driver > > also just skipped the bad block upon erasing without reproting them. > > I’m sorry, but I disagree. This code is not coming out of thin air. > It is a more or less vrbatim copy of the corresponding …
The u-boot command nand bad lists the offsets of the bad blocks. Solution . The solution is split into various pieces, one at each level. Boot loader first-stage . The boot loader itself contains a small first-stage boot loader for the S3C2410 Steppingstone. This code (mostly written in ARM assembly) was altered to detect and skip bad blocks.
In uboot. uboot>nand scrub.chip. In uboot. uboot>nand erase.chip clean. at this point I get usually 1,2 bad blocks which looks normal to me. In Linux we have few mtd partitions on this NAND chip. Unmount all of them and for all of them : linux>nandtest -m /dev/mtdx.
Our NAND has an erase size of 2MB and is split as follow: uboot (64MB), kernel (16MB), dtb (16MB), system (rest of the 4GB NAND) and there is plenty of spare blocks on each partition. When the system fails, looking at the Bad Blocks Table from u-boot we see: => nand bad Device 0 bad blocks: 06600000 0b400000 0b600000, 6/12/2019 · In most cases the block will be marked as bad . The number of bad blocks found using ‘ nand bad ‘ command should match those printed by the kernel at boot time. If uboot tries to access these bad blocks warning messages are printed.->>How Digi Embedded Linux and uboot shipped along handles bad blocks on Digi modules? Digi kernel do not use a BBT …
Our NAND has an erase size of 2MB and is split as follow: uboot (64MB), kernel (16MB), dtb (16MB), system (rest of the 4GB NAND) and there is plenty of spare blocks on each partition. When the system fails, looking at the Bad Blocks Table from u-boot we see: => nand bad Device 0 bad blocks: 06600000 0b400000 0b600000.
7/4/2011 · we had even tried to erase the whole chip and then re-write ubl+ u – boot to the NAND flash but the message does not disappear. the significant problem is that we found we faced with bad block that need to be skipped form the kernel but it turns out it cannot.
drivers/mtd/nand/nand_base.c:nand_erase_nand (), the very first thing. it does is call nand_block_checkbad (). without a bbt, it’ll tail into. chip->block_bad and the default nand_block_bad () reads the bad block. .
mtdids : nand0= NAND mtdparts: mtdparts= NAND :1m( u – boot ),-(ubi)-> nand erase ubi NAND erase : device 0 offset 0x100000, size 0xff00000 Erasing at 0x100000 — 0% complete. Erasing at 0xfd60000 — 99% complete. Skipping bad block at 0x0ff80000 Skipping bad block at 0x0ffa0000 Skipping bad block at 0x0ffc0000 Skipping bad block at 0x0ffe0000 OK
