I'm trying to make a work an SPI EEPROM (I tried with an AT25HP512 and an AT25256) connected to the expansion connector of an old MBX board featuring MPC860EN processor. I used the spi.c driver in u-boot patched from Gurevitch but nothing. Could I have problems with relocation of DPRAM for SPI? but I think this handled automatically. I simply defined CFG_SIMPLE_SPI_WRITE, CONFIG_SPI and CONFIG_SPI_X and it should be enough.
I double checked all the connections to the SPI EEPROM and they seem ok, when configuring the SPIMISO, SPIMOSI, SPICLK and SPISEL as GPIO active output I can measure a right voltage level on these pins when I write something to Port B data register. Unfortunately I have a not an oscilloscope to see what happen when I use the sspi command like this:
sspi 0 8 05 (with Gurevitch patch) 05 is the code to read a configuration register.
Sometimes the EEPROM answer FF, some others 00 , it is completely randomic.
I found that looping the SPIMISO and SPIMOSI with an external electric loop gives the right behaviour, I receive what I send. Anyone can help?
Bye, Antonio.