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| author | Jon Loeliger <jdl@freescale.com> | 2006-09-19 08:51:24 -0500 |
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| committer | Jon Loeliger <jdl@freescale.com> | 2006-09-19 08:51:24 -0500 |
| commit | afa98843e4665add11b69496341053b268156e3a (patch) | |
| tree | 116878b6b94920a5f282d0a16e4b9ad9dfaf57ff /doc | |
| parent | b440d0ef72e6278973d3220c10136a4c0624c286 (diff) | |
| parent | aeec782b020930732eab075af97212c3f03afcae (diff) | |
| download | u-boot-imx-afa98843e4665add11b69496341053b268156e3a.zip u-boot-imx-afa98843e4665add11b69496341053b268156e3a.tar.gz u-boot-imx-afa98843e4665add11b69496341053b268156e3a.tar.bz2 | |
Merge branch 'master' of http://www.denx.de/git/u-boot
Conflicts:
board/stxxtc/Makefile
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.nand-boot-ppc440 | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/doc/README.nand-boot-ppc440 b/doc/README.nand-boot-ppc440 new file mode 100644 index 0000000..a1c1d8c --- /dev/null +++ b/doc/README.nand-boot-ppc440 @@ -0,0 +1,60 @@ +----------------------------- +NAND boot on PPC440 platforms +----------------------------- + +This document describes the U-Boot NAND boot feature as it +is implemented for the AMCC Sequoia (PPC440EPx) board. + +The PPC440EP(x)/GR(x) cpu's can boot directly from NAND FLASH, +completely without NOR FLASH. This can be done by using the NAND +boot feature of the 440 NAND flash controller (NDFC). + +Here a short desciption of the different boot stages: + +a) IPL (Initial Program Loader, integrated inside CPU) +------------------------------------------------------ +Will load first 4k from NAND (SPL) into cache and execute it from there. + +b) SPL (Secondary Program Loader) +--------------------------------- +Will load special U-Boot version (NUB) from NAND and execute it. This SPL +has to fit into 4kByte. It sets up the CPU and configures the SDRAM +controller and the NAND controller so that the special U-Boot image can be +loaded from NAND to SDRAM. +This special image is build in the directory "nand_spl". + +c) NUB (NAND U-Boot) +-------------------- +This NAND U-Boot (NUB) is a special U-Boot version which can be started +from RAM. Therefore it mustn't (re-)configure the SDRAM controller. + +On 440EPx the SPL is copied to internal SRAM before the NAND controller +is set up. While still running from cache, I experienced problems accessing +the NAND controller. + + +Example: Build and install NAND boot image for Sequoia (440EPx): + +a) Configure for sequoia with NAND boot support: +# make sequoia_nand_config + +b) Build image(s) +# make + +This will generate the SPL image in the "nand_spl" directory: +nand_spl/u-boot-spl.bin +Also another image is created spanning a whole NAND block (16kBytes): +nand_spl/u-boot-spl-16k.bin +The main NAND U-Boot image is generated in the toplevel directory: +u-boot.bin +A combined image of u-boot-spl-16k.bin and u-boot.bin is also created: +u-boot-nand.bin + +This image should be programmed at offset 0 in the NAND flash: + +# tftp 100000 /tftpboot/sequoia/u-boot-nand.bin +# nand erase 0 60000 +# nand write 100000 0 60000 + + +September 07 2006, Stefan Roese <sr@denx.de> |