Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-14 Thread Wolfgang Grandegger
Kumar Gala wrote: > 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 co

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-14 Thread Kumar Gala
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 1

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-14 Thread Wolfgang Grandegger
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 boar

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-14 Thread Kumar Gala
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 >

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-14 Thread Wolfgang Grandegger
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 inte

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-10 Thread Wolfgang Grandegger
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 inte

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-10 Thread Kumar Gala
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 >>> MPC85

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-10 Thread Wolfgang Grandegger
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 >> correc

Re: [U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-10-09 Thread Kumar Gala
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 e

[U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

2008-09-30 Thread Wolfgang Grandegger
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 P