Q: How is the MAC restored to the SPI Flash at address 0x7F0000?

A:
Modify the DDR content at address 0xC0000000. The MAC address is printed on a sticker
pasted on the SOM Module. The MAC format is: 00:08:EE:xx:yy:zz where the last three “xx” pairs will be replaced by the final numbers on the sticker.

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1) Boot the OMAP-L138 kit to the U-Boot prompt. Enter the following commands. Enter the numbers that follow the “?”.
U-Boot> mm.b c0000000
c0000000: fb ? 00
c0000001: ef ? 08
c0000002: fd ? ee
c0000003: df ? xx
c0000004: ff ? yy
c0000005: ff ? zz
c0000006: bf ? q

2) Double check the values placed into memory.
U-Boot> md.b c0000000
c0000000: 00 08 ee xx yy zz bf ff f3 fd fb ff fe fd bf ef

3) Initialize the SPI Flash from u-boot.
U-Boot> sf probe 0

4) Write the MAC address from DDR to SPI Flash/
U-Boot> sf write c0000000 7f0000 6

5) Reset the OMAP-L138 kit. The U-Boot and Linux kernel will read the MAC address written to flash.

PRODUCTS Included:
OMAP-L138, AM1808, C6748