X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=doc%2FREADME.atmel_pmecc;h=cc0f73db8f1c70dbca708b5529ed5fee35e8a87e;hb=1ffdd3b5eb9994d3f0a763481397113ae33bc2b9;hp=41f3bd786084a46a4321c946e040ac1d4038b757;hpb=19d829fa60fc4e6df514a046142faaaf9fc8185d;p=karo-tx-uboot.git diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc index 41f3bd7860..cc0f73db8f 100644 --- a/doc/README.atmel_pmecc +++ b/doc/README.atmel_pmecc @@ -28,3 +28,23 @@ Take AT91SAM9X5EK as an example, the board definition file likes: #define CONFIG_PMECC_CAP 2 #define CONFIG_PMECC_SECTOR_SIZE 512 +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 need 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.