On Sun, May 17, 2020 at 1:28 PM Jupiter jupiter.hce@gmail.com wrote:
Sorry for a bit recalcitrant with the issue of calling 'ubi part" error -74 -EBADMSG, is it MTD issue or u-boot issue?
I used Linux kernel 4.19 to flash UBIFS volume images ubi.img to imx6ull NAND using following command in Linux:
flash_erase /dev/mtd2 0 0 ubiformat /dev/mtd2 -f ubi.img
The flashing image process went well, not errors, but in NAND booting (u-boot version 2018), running "ubi part" stuck following errors:
ubi0 error: ubi_io_read: error -74 (ECC error) while reading 64 bytes from PEB 2 35:0, read 64 bytes ubi0 error: ubi_io_read: error -74 (ECC error) while reading 2048 bytes from PEB 235:2048, read 2048 bytes
The document says "The -74 error code is -EBADMSG and means an ECC error. In other words, UBI tried to read some data from the flash, but the flash driver found that there is an uncorrectable ECC error, and returned -EBADMSG."
My question for ubiformat, how does it write ECC to UBIFS volume partition when it flashed UBIFS image to NAND?
Neither UBI nor UBIFS care about ECC. The MTD stack does. If you write something in Linux you cannot read back in u-boot a common problem is that u-boot and Linux use different MTD settings (layout, ECC, etc...).