Hello everyone,
I was wondering if anyone can shed any light on the problem I encountered trying to get 16x Micron SLC NAND (MT29F2G16AA; 2K page, 64byte spare area and 128K erase block) to work with Freescale i.MX258 SoC.
Description: ========= (1) I am booting successfully from NAND. (2) When I try to save the environment, it seems that write works (saveenv) and I can verify that all the data is realy properly written to the NAND (nand dump 40000 20000) (3) Data in the OOB area also seems logical: first 9-byte ECC sequnce (calculated for the first 512-byte subpage that actualy contains the data) is different from 3 other (mutualy identical) ECC sequences calculated for the empty subpages. (4) reset produces : "MXC_NAND: HWECC uncorrectable ECC error in block 2 page 128 subpage 0" (which points to where I have my env offset set to (0x40000) with no redundant area) "*** Warning - bad CRC or NAND, using default environment"
My Troubleshooting: ================ * I tried using different block to store the environment and all of them behave the same (as stated above). * I double-checked i.MX258 datasheet to make sure that NFC (v1.1) is properly initialized (4-symbol ECC and all relevant NFC/CCM registers) * I tried Freescale's version of the U-boot (released as a part of their Board Support Package) with worse results (their u-boot version seems to be written only for 8x NAND) * I made sure that OOB layout used in U-boot matches what NFC data sheet (IMX25.pdf) requires.
Supporting Info: ============ Source tree: u-boot-2009.11.1 source tree with set of Rigby patches applied Compiler: Code Sourcery arm cross-compiler (arm-2008q3/arm-none-eabi-gcc ver 4.3.2) Hardware: custom-built board
Extra question: =========== "nand dump 40000" produces the output in which all empty areas of the nand are marked as "00 10" instead of "ff ff". Why?
I really do appreciate all suggestions and ideas. Thanks.
Cheers, Momcilo Radulovic