On Tue, Mar 09, 2021 at 02:15:19PM +0800, dillon.minfei@xxxxxxxxx wrote: > From: dillon min <dillon.minfei@xxxxxxxxx> > > This patch intend to fix ubi filesystem mount failed on MYS-6ULX-IOT board, > from Micron MT29F2G08ABAEAWP's datasheets, we need to choose 4-bit ECC. > > Table 18: Error Management Details > > Description Requirement > > Minimum number of valid blocks (NVB) per LUN 2008 > Total available blocks per LUN 2048 > First spare area location x8: byte 2048 x16: word 1024 > Bad-block mark x8: 00h x16: 0000h > Minimum required ECC 4-bit ECC per 528 bytes > Minimum ECC with internal ECC enabled 4-bit ECC per 516 bytes (user data) + 8 > bytes (parity data) > Minimum required ECC for block 0 if PROGRAM/ > ERASE cycles are less than 1000 1-bit ECC per 528 bytes 4-bit ECC is the minimum this chip requires. There's nothing wrong with choosing a better ECC like the GPMI driver does by default. It looks like you are papering over some other problem. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
