The information in the SabreLite README is inaccurate and sparse. The upstream U-Boot can boot the SabreLite from SPI-NOR. Additionally, the freely available imx_loader tool can be easily used to boot a board with a corrupted SPI, the official Freescale/NXP manufacturing tools are not required.
Reformat the document, adding a description of how to boot from SPI-NOR and adding a brief description of how to recover the board should the SPI-NOR be corrupted using imx_loader.
Signed-off-by: Martyn Welch martyn.welch@collabora.com
---
.../boundary/nitrogen6x/README.mx6qsabrelite | 119 ++++++++++++------ 1 file changed, 83 insertions(+), 36 deletions(-)
diff --git a/board/boundary/nitrogen6x/README.mx6qsabrelite b/board/boundary/nitrogen6x/README.mx6qsabrelite index 12a9c856cf..6283c9575e 100644 --- a/board/boundary/nitrogen6x/README.mx6qsabrelite +++ b/board/boundary/nitrogen6x/README.mx6qsabrelite @@ -1,72 +1,119 @@ U-Boot for the Freescale i.MX6q SabreLite board +===============================================
This file contains information for the port of U-Boot to the Freescale i.MX6q SabreLite board.
-1. Boot source, boot from SD card ----------------------------------
-The recent mainline U-Boot for the Freescale i.MX6q SabreLite board supports -boot from SD card only. However, by default, the SabreLite -boards boot from the SPI NOR flash. These boards need to be reflashed with -a small SD card loader to support boot from SD card. This small SD card loader -will be flashed into the SPI NOR. The board will still boot from SPI NOR, but -the loader will in turn request the BootROM to load the U-Boot from SD card. +1. Build +-------- + +To build U-Boot for the SabreLite board: + + make mx6qsabrelite_config + make + + +2. Boot from SD card +-------------------- + +The SabreLite boards boot from the SPI NOR flash. These boards need their SPI +to be reflashed with a small SD card loader to support boot from SD card. The +board will still boot from SPI NOR, but the loader will in turn request the +BootROM to load the U-Boot from SD card.
The SD card loader is available from
https://wiki.linaro.org/Boards/MX6QSabreLite
-under a open-source 3-clause BSD license. +This is provided under a open-source 3-clause BSD license.
-To update the SPI-NOR on the SabreLite board without the Freescale -manufacturing tool use the following procedure: +To following procedure can be used to update the SPI-NOR on the SabreLite +board:
1. Write this SD card loader onto a large SD card using:
- sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx + sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx
-Note: Replace sXx with the device representing the SD card in your system. + Note: Replace sXx with the device representing the SD card in your system.
-Note: This writes SD card loader at address 0 + Note: This writes SD card loader at address 0
2. Put this SD card into the slot for the large SD card (SD3 on the bottom of -the board). Make sure SW1 switch is at position "00", so that it can boot -from the fuses. + the board). Make sure SW1 switch is at position "00", so that it can boot + from the fuses.
3. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot -(the default one the board is shipped with, starting from the SPI NOR) and -enter the following commands: + (the default one the board is shipped with, starting from the SPI NOR) and + enter the following commands: + + MX6Q SABRELITE U-Boot > mmc dev 0 + MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200 + MX6Q SABRELITE U-Boot > sf probe + MX6Q SABRELITE U-Boot > sf erase 0 0x40000 + MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000
- MX6Q SABRELITE U-Boot > mmc dev 0 - MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200 - MX6Q SABRELITE U-Boot > sf probe - MX6Q SABRELITE U-Boot > sf erase 0 0x40000 - MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000 +4. Write the u-boot.imx produced during the U-Boot build to the SD card:
-4. done. + sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2 && sudo sync
-In case you somehow do not succeed with this procedure you will have to use -the Freescale manufacturing tool in order to reflash the SPI-NOR. + Note: Replace sXx with the device representing the SD card in your system. + +5. Re-insert the SD card back in the slot for the large SD card and power-cycle + the board.
Note: The board now boots from full size SD3 on the bottom of the board. NOT the micro SD4/BOOT slot on the top of the board. I.e. you have to use full size SD cards.
-This information is taken from +This information originally taken from:
-https://wiki.linaro.org/Boards/MX6QSabreLite + https://wiki.linaro.org/Boards/MX6QSabreLite
-2. Build ---------
-To build U-Boot for the SabreLite board: +3. Boot from SPI NOR +--------------------
- make mx6qsabrelite_config - make +The SabreLite board can also boot U-Boot directly from the SPI NOR flash: + +1. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot + and enter the following commands: + + => mmc dev 0 + => mmc read 0x10800000 0x400 0x80000 + => sf probe 0 + => sf erase 0 0xc0000 + => sf write 0x10800000 0x400 0x80000 + +Note: This procedure assumes you have booted using the desired U-Boot from an + SD card as prepared in the previous section. Alternative mechanisms, such + as using tftpboot to copy an alternative U-Boot image into memory can + also be used. + + +4. Recovering SPI-NOR +--------------------- + +In case you somehow do not succeed with this procedure you can upload U-Boot +via USB: + +1. Download and install the imx_loader following the instructions provided: + + https://github.com/boundarydevices/imx_usb_loader + +2. Connect the board to USB via the USB OTG port. + +3. Make sure SW1 switch is at position "01", so that it can boot from USB OTG. + +4. Power-up the SabreLite and run the imx_loader to upload the U-Boot image: + + sudo imx_usb u-boot.imx + +Note: This will upload and run the U-Boot image in memory, the SPI will not be + reprogrammed and this procedure will need to be repeated if the board is + reset.
-To copy the resulting u-boot.imx to the SD card: +5. Use one of previous descriptions to re-flash the SPI-NOR as required.
- sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2&&sudo sync +6. Ensure SW1 is returned to "00" to boot from the fuses once done.
-Note: Replace sXx with the device representing the SD card in your system.