Kumar Gala wrote: > > On Oct 14, 2008, at 2:11 PM, Wolfgang Grandegger wrote: > >> Kumar Gala wrote: >>> On Oct 10, 2008, at 2:29 AM, Wolfgang Grandegger wrote: >>> >>>> Kumar Gala wrote: >>>>> On Sep 30, 2008, at 3:55 AM, Wolfgang Grandegger wrote: >>>>> >>>>>> Measurements with our MPC8544 board showed that the I2C bus >>>>>> frequency >>>>>> is wrong by a factor of 1.5. Obviously, the interpretation of the >>>>>> MPC85xx_PORDEVSR2_SEC_CFG bit of the cfg_sec_freq register is not >>>>>> correct. There seems to be an error in the 8544 RM. >>>>>> >>>>>> Signed-off-by: Wolfgang Grandegger <[EMAIL PROTECTED]> >>>>>> --- >>>>>> cpu/mpc85xx/speed.c | 4 ++-- >>>>>> 1 file changed, 2 insertions(+), 2 deletions(-) >>>>> can you do me a favor and dump the value of MPC85xx_PORDEVSR2. Also >>>>> can you tell me what rev 8544 you have. >>>> See below: >>>> >>>> [EMAIL PROTECTED] >>>> >>>> CPU: 8544E, Version: 1.1, (0x803c0111) >>>> Core: E500, Version: 2.2, (0x80210022) >>>> Clock Configuration: >>>> CPU: 667 MHz, CCB: 334 MHz, >>>> DDR: 167 MHz (334 MT/s data rate), LBC: 41 MHz >>>> L1: D-cache 32 kB enabled >>>> I-cache 32 kB enabled >>>> Board: Socrates >>>> >>>> Wolfgang. >>> >>> thanks. How did you do the measurements that got you this 1.5x factor? >> >> This afternoon I re-measured the I2C bus clock frequency with the >> oscilloscope at the I2C clock line on our Socrates MPC8544 board. With >> the patch applied, I measured the correct frequency of 100 kHz. Without, >> it was a factor of 1.5 too high. > > are you able to change cfg_seq_freq on the board?
At least I don't know how. It's defined via hardware strap, I imagine. Wolfgang. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
