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? - k _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
