On 12/12/07, sivaji rameshmrm@gmail.com wrote:
Hai, We have designed MPC8548 based AMC card. We are using u-boot-1.2.0 and it was up. Now we plan to boot the uboot in the EEPROM without using FLASH. Is it possible to boot the uboot in the EEPROM ?. We are using AT24C64C EEPROM(64KB) and it was configured as Extended I2C addressing mode.
In addition to David's comments about the EEPROM being only 8K, I'm doubtful that u-boot on the 8548 can fit even in 64k. The typical build makes it 512k, though I think the actual code size is closer to 150K. I think 8k would require some sort of magic.
IIRC, the EEPROM can contain a configuration sequence, and then a data blob to copy somewhere, which is then executed. If you want that to be u-boot, you'll need a bigger EEPROM. Otherwise, you need to write a boot loader. Is there a reason you don't want to boot from Flash? I'm not familiar with that use case.
Andy