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1U-Boot for the Freescale i.MX6q SabreLite board
2
3This file contains information for the port of U-Boot to the Freescale
4i.MX6q SabreLite board.
5
61. Boot source, boot from SD card
7---------------------------------
8
9The recent mainline U-Boot for the Freescale i.MX6q SabreLite board supports
10boot from SD card only. However, by default, the SabreLite
11boards boot from the SPI NOR flash. These boards need to be reflashed with
12a small SD card loader to support boot from SD card. This small SD card loader
13will be flashed into the SPI NOR. The board will still boot from SPI NOR, but
14the loader will in turn request the BootROM to load the U-Boot from SD card.
15
16The SD card loader is available from
17
18https://wiki.linaro.org/Boards/MX6QSabreLite
19
20under a open-source 3-clause BSD license.
21
22To update the SPI-NOR on the SabreLite board without the Freescale
23manufacturing tool use the following procedure:
24
251. Write this SD card loader onto a large SD card using:
26
27 sudo dd if=iMX6DQ_SPI_to_uSDHC3.bin of=/dev/sXx
28
29Note: Replace sXx with the device representing the SD card in your system.
30
31Note: This writes SD card loader at address 0
32
332. Put this SD card into the slot for the large SD card (SD3 on the bottom of
34the board). Make sure SW1 switch is at position "00", so that it can boot
35from the fuses.
36
373. Power-up the SabreLite, press 'space' to enter command mode in the U-Boot
38(the default one the board is shipped with, starting from the SPI NOR) and
39enter the following commands:
40
41 MX6Q SABRELITE U-Boot > mmc dev 0
42 MX6Q SABRELITE U-Boot > mmc read 0x10800000 0 200
43 MX6Q SABRELITE U-Boot > sf probe
44 MX6Q SABRELITE U-Boot > sf erase 0 0x40000
45 MX6Q SABRELITE U-Boot > sf write 0x10800000 0 0x40000
46
474. done.
48
49In case you somehow do not succeed with this procedure you will have to use
50the Freescale manufacturing tool in order to reflash the SPI-NOR.
51
52Note: The board now boots from full size SD3 on the bottom of the board. NOT
53      the micro SD4/BOOT slot on the top of the board. I.e. you have to use
54      full size SD cards.
55
56This information is taken from
57
58https://wiki.linaro.org/Boards/MX6QSabreLite
59
602. Build
61--------
62
63To build U-Boot for the SabreLite board:
64
65 make mx6qsabrelite_config
66 make
67
68To copy the resulting u-boot.imx to the SD card:
69
70 sudo dd if=u-boot.imx of=/dev/sXx bs=512 seek=2&&sudo sync
71
72Note: Replace sXx with the device representing the SD card in your system.
73