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. Wolfgang. _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
