OMAPl138

Hi

Sorry for the late response

Support to change the default to 456MHz/1.3V should be available in the ubl/uboot in the latest SDK

The UBL should be at:

psp/board-utilities/src/boot-strap/armulb-x.x.x.x

 The tps65070.c included will have the APIs for setting the voltage to 1.3.

You might find the following links useful too

http://processors.wiki.ti.com/index.php/OMAP-L1_Linux_Drivers_Usage#CPUFreq

http://processors.wiki.ti.com/index.php/OMAPL1:_Changing_the_Operating_Point

If you run into any issues with the uboot etc, I recommend you post a query on the E2E forum. 

Regards

Mukul 

Hi Mukul,

         Thanks for the reply.I am using u-boot-2009.11-psp03.20.00.14 & the DVSDK is dvsdk_omapl138-evm_4_01_00_09_setuplinux. This U-Boot by default using 300Mhz & 1.2 V.Whether this version of uboot have the support to change it's OPP & CPU freq ? It's compulsory to make the changes in  uboot because in my custom they just changed the maximum operating frequency only or else shall i use the same uboot whatever we had now.If i have to do changes in uboot can you suggest me a link having info about the which all are the files i have to make a change? I am a newbee to uboot .So, Please help me out to get rid of this issue. 

The operating points are set up by the UBL, not U-Boot. Look under psp/board-utilities/src/boot-strap/armubl-03.xx.xx.xx/include/device.h and modify the DEVICE_CONFIG_OPP define to match the frequency/voltage you need. Then rebuild the UBL in CCS and reflash it all according to the included user guide.

Jeff

Hi Jeff,

        Thanks for considering my post. According to you no need to change anything in uboot regarding the changes made for maximum operating frequency.Only we need to make changes in ubl only.right?

Regards,

Shankaralingam

Yes if you modify the PLL in the UBL, U-boot will automatically adjust the UART divider to achieve the desired baud rate.

Jeff