No U-boot prompt on PPC440GP
I need help getting u-boot to display its interactive prompt. I posted
yesterday to the u-boot mailing list, but I haven't gotten a response yet.
I have an IBM/AMCC PPC440GP evaluation board ("Ebony"). I built u-boot
with gcc 3.4.4 by issuing
which built u-boot without any errors. I did not modify the
configuration header file at all. The default disables automatic boot,
so I should just get a prompt.
I wrote the resulting u-boot.bin file to flash using a JTAG programmer.
I set the DIP switches and jumpers according to the README.ebony
instructions. When I turn on the power, it displays some console text
and then stops without a prompt. The console text is as follows:
----begin console output-----
U-Boot 1.1.2 (Jul 6 2005 - 15:51:04)
IBM PowerPC 440 GP Rev. C
Board: IBM 440GP Evaluation Board (Ebony)
VCO: 600 MHz
CPU: 300 MHz
PLB: 100 MHz
OPB: 50 MHz
EPB: 50 MHz
DRAM: I2c read: failed 4
I2c read: failed 4
-----end console output-----
Nothing more happens. No prompt is displayed. I tried the J41/J42
bootstrap corruption directions, but it did not seem to have any effect.
If I press the reset switch, I get the same output as when I power up,
except that the last line (128 MB) is not generated.
I assume the I2c read failures are not normal, but I am not sure. Could
someone suggest what to do next?