From a81c90f4c8a7e77a0a6bf4b7288bf32f15d923a2 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Tue, 10 Jun 2014 00:03:59 -0300 Subject: mx28evk: Add documentation on how to boot from SPI NOR MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Explain the necessary steps in order to boot from SPI NOR. Based on a earlier submission from Mårten Wikman. Signed-off-by: Mårten Wikman Signed-off-by: Fabio Estevam --- doc/README.mxs | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'doc/README.mxs') diff --git a/doc/README.mxs b/doc/README.mxs index 0235a5a..ed2e568 100644 --- a/doc/README.mxs +++ b/doc/README.mxs @@ -23,6 +23,7 @@ Contents 2) Compiling U-Boot for a MXS based board 3) Installation of U-Boot for a MXS based board to SD card 4) Installation of U-Boot into NAND flash on a MX28 based board +5) Installation of U-boot into SPI NOR flash on a MX28 based board 1) Prerequisites ---------------- @@ -262,3 +263,28 @@ There are two possibilities when preparing an image writable to NAND flash. In case the user needs to boot a firmware image bigger than 1Mb, the user has to adjust the "update_nand_firmware_maxsz" variable for the update scripts to work properly. + +5) Installation of U-Boot into SPI NOR flash on a MX28 based board +------------------------------------------------------------------ + +The u-boot.sb file can be directly written to SPI NOR from U-boot prompt. + +Load u-boot.sb into RAM, this can be done in several ways and one way is to use +tftp: + => tftp u-boot.sb 0x42000000 + +Probe the SPI NOR flash: + => sf probe + +(SPI NOR should be succesfully detected in this step) + +Erase the blocks where U-boot binary will be written to: + => sf erase 0x0 0x80000 + +Write u-boot.sb to SPI NOR: + => sf write 0x42000000 0 0x80000 + +Power off the board and set the boot mode DIP switches to boot from the SPI NOR +according to MX28 manual section 12.2.1 (Table 12-2) + +Last step is to power up the board and U-boot should start from SPI NOR. -- cgit v1.1