From 5c390a5b26ce53a6534b99c22bb762484e6b3497 Mon Sep 17 00:00:00 2001 From: Andreas Bießmann Date: Mon, 19 May 2014 14:23:40 +0200 Subject: arm:at91: enable ROM loadable atmel image For sama5d3xek we need to modify the SPL image for correct detection by ROM code. Signed-off-by: Andreas Bießmann Tested-by: Bo Shen --- doc/README.atmel_pmecc | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'doc/README.atmel_pmecc') diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc index cf8373b54e8..cc0f73db8f1 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 + +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. -- cgit v1.2.3