Hello,
I am working on an update to a Linux configuration for a custom TI DM355 based hardware platform which uses a Micron MT29F4G08ABADAWP NAND flash device and U-Boot 2013.07 (which I can't change). The boards have been deployed in the field over a number of years using the NAND flash to store the Linux kernel and a CramFS partition and all works well with the following settings in the board config file:
#define CONFIG_NAND_DAVINCI #define CONFIG_SYS_NAND_CS 2 #define CONFIG_SYS_NAND_USE_FLASH_BBT #define CONFIG_SYS_NAND_4BIT_HW_ECC_OOBFIRST #define CONFIG_SYS_NAND_PAGE_2K #define CONFIG_SYS_NAND_LARGEPAGE #define CONFIG_SYS_NAND_BASE_LIST { 0x02000000, } #define CONFIG_SYS_MAX_NAND_DEVICE 1 #define CONFIG_SYS_NAND_MAX_CHIPS 1
As part of the update we are moving to a UBI root file system and this is where problems are starting. As an initial test I am using the following commands in U-Boot to create the UBI partition:
U-Boot> nand erase.part rootfs U-Boot> ubi part rootfs
All appears to be well but if I reset the hardware and then rerun the "ubi part rootfs" command then I am bombarded with errors of the following type which never seem to end but just change in the PEB being referenced:
UBI error: ubi_io_read: error -74 while reading 64 bytes from PEB 0:0, read 64 bytes UBI error: ubi_io_read: error -74 while reading 512 bytes from PEB 0:512, read 512 bytes UBI error: ubi_io_read: error -74 while reading 64 bytes from PEB 1:0, read 64 bytes UBI error: ubi_io_read: error -74 while reading 512 bytes from PEB 1:512, read 512 bytes
The datasheet for the flash device says that in 8-bit mode a page size is 2048 + 64 bytes and as far as I can tell doesn't mention subpages and so I am confused by the output from the "ubi part rootfs" command that states that there are 512 byte sub-pages available:
UBI: physical eraseblock size: 131072 bytes (128 KiB) UBI: logical eraseblock size: 129024 bytes UBI: smallest flash I/O unit: 2048 UBI: sub-page size: 512 UBI: VID header offset: 512 (aligned 512) UBI: data offset: 2048
I have had a look through the source but can't find anyway to disable sub-page support or to tell it that a sub-page is the same size as the smallest flash I/O unit. Then again, I could be looking in completely the wrong place.
Any thoughts...
Andy.