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Diffstat (limited to 'doc/README.atmel_pmecc')
| -rw-r--r-- | doc/README.atmel_pmecc | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc index cf8373b54..cc0f73db8 100644 --- a/doc/README.atmel_pmecc +++ b/doc/README.atmel_pmecc @@ -27,3 +27,24 @@ Take AT91SAM9X5EK as an example, the board definition file likes: #define CONFIG_ATMEL_NAND_HW_PMECC 1 #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 <andreas.devel@googlemail.com> + +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. |