Info required for Overclocking 814x

Its not clear from your question what exactly you are trying to overclock ? As in which peripheral.

Archith

Hi Archit,

We wanted to overclock IVAHD from current 266 MHz to around 350 Mhz.

Please do let me know if we can overclock it?, if so please let us know the procedure.

Regards,

Sudeep

You need to modify and re-build u-boot for changing the PLL frequency of the IVAHD

In the file <u-boot_ROOT>/arch/arm/include/asm/arch-ti81xx/clocks_ti814x.h,

#define IVA_N           19

#define IVA_M           (pg_val_ti814x(612, 612))

#define IVA_M2          2

#define IVA_CLKCTRL     0x801

The above entry means that the IVAHD is already clocked to 612/2=306MHz. 

Change the entry to and re-compile the u-boot.

#define IVA_M           (pg_val_ti814x(700, 700))

But please be aware that unless you have a speed-binned 814X part on your board, capable of running at 350Mhz, your application may have unpredictable behavior. On how to get speed bin parts, please talk to your TI representative.

Archith

Hi Archit,

I have a another question regarding the real time encoding using capture encode setup.

We find that when we set the bit-rate to 16Mbps (16000000 bits/Sec), we see a lot of skips in the frame encoded.

Then we tried to find out the reason, the "fwrite" infact was consuming more time in between some frames.

While if we encode at a smaller bit-rate we didn't find any skips.

We also tried to set the setvbuf using the options_IOFBF, _IOLBF, _IONBF, But it didn't help much.

Kindly provide your inputs for the same.

Thanks,

Sudeep