X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=doc%2FREADME.atmel_pmecc;h=c86d085779458f8fb179920496829ab0c22e461f;hb=e836a71b700862b4eacc20209ec225aa427c56e3;hp=41f3bd786084a46a4321c946e040ac1d4038b757;hpb=47f75cf2e1d8648e3438630f3a4bddf9b5caa25d;p=oweals%2Fu-boot.git diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc index 41f3bd7860..c86d085779 100644 --- a/doc/README.atmel_pmecc +++ b/doc/README.atmel_pmecc @@ -20,11 +20,30 @@ To use PMECC in this driver, the user needs to set: 2. The PMECC sector size: CONFIG_PMECC_SECTOR_SIZE. It only can be 512 or 1024. -Take AT91SAM9X5EK as an example, the board definition file likes: +Take 'configs/at91sam9x5ek_nandflash_defconfig' as an example, the board +configuration file has the following entries: -/* PMECC & PMERRLOC */ -#define CONFIG_ATMEL_NAND_HWECC 1 -#define CONFIG_ATMEL_NAND_HW_PMECC 1 -#define CONFIG_PMECC_CAP 2 -#define CONFIG_PMECC_SECTOR_SIZE 512 + 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 + +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.