2008-10-10 10:30:52     L R Channel Swap in BF533

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2008-10-10 10:30:52     L R Channel Swap in BF533

Appalayagari Sreedhar (INDIA)

Message: 63419   

 

Hi,

 

Does anyone has implemented workaround for the anamoly L R Channel Swap in BF533.

 

05000265 -

 

- Sensitivity To Noise with Slow Input Edge Rates on External SPORT TX and RX Clocks:

 

Best Regards, Sreedhar.

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2008-10-10 12:07:08     Re: L R Channel Swap in BF533

Robin Getz (UNITED STATES)

Message: 63433   

 

Sreedhar:

 

rgetz@imhotep:~/blackfin/trunk/uClinux-dist/linux-2.6.x> grep 265 include/asm-blackfin/mach-*/anomaly.h

include/asm-blackfin/mach-bf527/anomaly.h:#define ANOMALY_05000265 (1)

include/asm-blackfin/mach-bf533/anomaly.h:#define ANOMALY_05000265 (1)

include/asm-blackfin/mach-bf537/anomaly.h:#define ANOMALY_05000265 (1)

include/asm-blackfin/mach-bf548/anomaly.h:#define ANOMALY_05000265 (1)

include/asm-blackfin/mach-bf561/anomaly.h:#define ANOMALY_05000265 (__SILICON_REVISION__ < 5)

 

But, there are no uses of that in the kernel - since all the wordarounds are HARDWARE workarounds, or done in U-Boot (u-boot-1.1.6/cpu/blackfin/initcode.c)

 

#ifndef CONFIG_PLL_CTL_VAL

# define CONFIG_PLL_CTL_VAL (SPORT_HYST | (CONFIG_VCO_MULT << 9) | CONFIG_CLKIN_HALF)

#endif

 

 

So, I think it is taken care of.

 

-Robin

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2008-10-13 02:39:30     Re: L R Channel Swap in BF533

Appalayagari Sreedhar (INDIA)

Message: 63514   

 

Hi Robin,

 

Thankyou very much.

 

I am working with the u-boot version u-boot 1.1.6 2007 R1.

 

I could not find this macro CONFIG_PLL_CTL_VAL in this version of u-boot.

 

PLL_CTL value is configured in the file. cpu/bf533/init_sdram.S

 

Macro CONFIG_PLL_CTL_VAL is found in the latest u-boot 1.1.6 2008 R1.5. and also the work around.

 

Problem is now i can not change the u-boot, Is there any way I can do the work around in the kernel, I hope there will be a way to solve this problem.

 

can you please help me to solve this problem.

 

Best Regards, Sreedhar.

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2008-10-13 02:45:12     Re: L R Channel Swap in BF533

Mike Frysinger (UNITED STATES)

Message: 63515   

 

you have all the source code and you see the required change.  so just make it in your own version.

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