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diff --git a/doc/README.nand-boot-ppc440 b/doc/README.nand-boot-ppc440 deleted file mode 100644 index 1e9c102644b..00000000000 --- a/doc/README.nand-boot-ppc440 +++ /dev/null @@ -1,60 +0,0 @@ ------------------------------ -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 description 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> |