From: matti kaasinen [matti.kaasinen@gmail.com]
[...]
You mentioned, that OMAP_ECC_BCH8_CODE_HW mode and ecc.bytes=14 has to be used. I suppose that at least the former option requires kernel patching like explained in http://processors.wiki.ti.com/index.php/AM35x-OMAP35x PSP_04.02.00.07_UserGuide#Selecting_NAND_ECC_scheme_for_Linux_Kernel
In any case I did not find configuration option in menuconfig for that. Will "ecc.bytes=14" setting be taken care by that selection, too?
Yes, the selection of "BCH8" along with "H/W ECC for OMAP devices" should automatically select (OMAP_ECC_BCH8_CODE_HW) which implicitly would configure chip->ecc.bytes = 14.
The layout will also be selected automatically, and this all is in accordance to NAND boot as documented in AM335x TRM [1]. - http://www.ti.com/product/am3359 - [1] latest AM3359 TRM http://www.ti.com/litv/pdf/spruh73i
(a) Section: 26.1.7.4 NAND - This section explains ROM code behavior for booting from NAND. ROM code also fetches device geometry from ONFI params. In addition there is a separate boot mode (called NANDI2C) where device parameters can be fetched from on-board EEPROM.
(b) Figure 26-15. ECC Data Mapping for 2 KB Page and 8b BCH Encoding - This figure explains ecc layout used by ROM code, which is what I'm using as reference for BCH8_HW algorithm.
with regards, pekon