I have a port of u-boot for csb272 and I got linux booting on it :)
For linux, I used "linuxppc-2.4" cvs tree (2.4.24-pre4) but I had to change csb272.h to include <asm/ppcboot.h> instead of the bd_t definition that was in csb272.h. I think the default csb272.h bt_t was setup to boot Linux from Micromonitor which is default monitor program as shipped from Cogent.
According to u-boot documentation u-boot.h board info structure is backwards compatible with ppcboot one so it made sense for me to include ppcboot.h (which was already there as checked out) instead of manually copying the structure.
Now, I am trying to get I2C working on Linux. The following is from Linux .config file:
# # I2C support # CONFIG_I2C=y # CONFIG_I2C_ALGOBIT is not set # CONFIG_SCx200_ACB is not set # CONFIG_I2C_ALGOPCF is not set CONFIG_I2C_IBM_IIC=y CONFIG_I2C_CHARDEV=y CONFIG_I2C_PROC=y
However while compiling i2c_ibm_iic.c, the compiler gives error on some fields missing from bt_t. Namely,
bi_iic_fast bi_opb_busfreq