mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-10-31 08:21:36 +01:00
49ad40298c
This commit converts the following items to Kconfig: CONFIG_ATMEL_NAND_HWECC CONFIG_ATMEL_NAND_HW_PMECC CONFIG_PMECC_CAP CONFIG_PMECC_SECTOR_SIZE CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER [PMECC References] https://www.at91.com/linux4sam/bin/view/Linux4SAM/PmeccConfigure https://www.at91.com/linux4sam/bin/view/Linux4SAM/AT91Bootstrap [Mailing List Thread] https://lists.denx.de/pipermail/u-boot/2018-December/350666.html Fixes: 5541543f ("configs: at91: Remove CONFIG_SYS_EXTRA_OPTIONS assignment") [trini: Make the migration be size neutral and possibly not fix the above in all cases] Reported-by: Daniel Evans <photonthunder@gmail.com> Cc: Eugen Hristev <eugen.hristev@microchip.com> Signed-off-by: Derald D. Woods <woods.technical@gmail.com> Signed-off-by: Tom Rini <trini@konsulko.com>
50 lines
2.3 KiB
Plaintext
50 lines
2.3 KiB
Plaintext
How to enable PMECC(Programmable Multibit ECC) for nand on Atmel SoCs
|
|
-----------------------------------------------------------
|
|
2012-08-22 Josh Wu <josh.wu@atmel.com>
|
|
|
|
The Programmable Multibit ECC (PMECC) controller is a programmable binary
|
|
BCH(Bose, Chaudhuri and Hocquenghem) encoder and decoder. This controller
|
|
can be used to support both SLC and MLC NAND Flash devices. It supports to
|
|
generate ECC to correct 2, 4, 8, 12 or 24 bits of error per sector (512 or
|
|
1024 bytes) of data.
|
|
|
|
Following Atmel AT91 products support PMECC.
|
|
- AT91SAM9X25, X35, G25, G15, G35 (tested)
|
|
- AT91SAM9N12 (not tested, Should work)
|
|
|
|
As soon as your nand flash software ECC works, you can enable PMECC.
|
|
|
|
To use PMECC in this driver, the user needs to set:
|
|
1. the PMECC correction error bits capability: CONFIG_PMECC_CAP.
|
|
It can be 2, 4, 8, 12 or 24.
|
|
2. The PMECC sector size: CONFIG_PMECC_SECTOR_SIZE.
|
|
It only can be 512 or 1024.
|
|
|
|
Take 'configs/at91sam9x5ek_nandflash_defconfig' as an example, the board
|
|
configuration file has the following entries:
|
|
|
|
CONFIG_PMECC_CAP=2
|
|
CONFIG_PMECC_SECTOR_SIZE=512
|
|
CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER=y
|
|
|
|
How to enable PMECC header for direct programmable boot.bin
|
|
-----------------------------------------------------------
|
|
2014-05-19 Andreas Bießmann <andreas@biessmann.org>
|
|
|
|
The usual way to program SPL into NAND flash is to use the SAM-BA Atmel tool.
|
|
This however is often not usable when doing field updates. To be able to
|
|
program a SPL binary into NAND flash we need to add the PMECC header to the
|
|
binary before. Chapter '12.4.4.1 NAND Flash Boot: NAND Flash Detection' in
|
|
sama5d3 SoC spec (as of 03. April 2014) defines how this PMECC header has to
|
|
look like. In order to do so we have a new image type added to mkimage to
|
|
generate this PMECC header and integrated this into the build process of SPL.
|
|
|
|
To enable the generation of atmel PMECC header for SPL one needs to define
|
|
CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER. The required parameters are taken from
|
|
board configuration and compiled into the host tools atmel_pmecc_params. This
|
|
tool will be called in build process to parametrize mkimage for atmelimage
|
|
type. The mkimage tool has intentionally _not_ compiled in those parameters.
|
|
|
|
The mkimage image type atmelimage also set the 6'th interrupt vector to the
|
|
correct value. This feature can also be used to setup a boot.bin for MMC boot.
|