Building ubl for LogicPD OMAPL138 EVM board - UART, AISgen issues

Hi Jeff

jc said:

Try flashing the prebuilt UBL that came with the PSP package. I know that one is configured for UART2.

Yes, I think we've done that. But I would have expected the supplied UBL project to match that pre-built UBL? We want to extend the UBL and I was hoping that source would have given us a 'running start'.

jc said:

Also I would suggest trying the serial flasher tool and the UBL that gets built from that package, just for comparison:

http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L138

Both have been tested to work on the EVM.

I'll take a look at that, thanks. I hadn't realised it included UBL source.

Thanks

Jon N

Apparently this is not the case. If you want to rebuild you will have to make the changes for it to use UART2 instead of UART0. It shouldn't be much more than a few #define changes.

Jeff

Hi guys,

I am using DaVinci-PSP-SDK-03.20.00.11 and OMAP L138 EVM board. I must admit I am struggling finding bits and pieces of information.
For instance I would love to know where exactly is UBL programmed (memory address, how long it is etc), same for U-boot. 
What exactly happens after you reset EVM?

I've got basic audioSoc demo going using tftp to download Linux kernel, file system and application files.

Now I would like to have all these components moved to SPI flash and basically have the same demo running without EVM connected to PC. 

Can you shed a bit of light on how to build UBL, what are the steps involved? Also, how the U-boot comes into picture?

Any help is appreciated,

Alija

The UBL is flashed to address 0 of the SPI flash, and UBOOT is put at address 0x10000.

The UBL size is around 10KB, and UBOOT can be over 150KB.

When the EVM is reset, the ROM bootloader the program found in address 0 of the SPI flash. The end of the UBL finds and loads UBOOT from the SPI flash and then jumps to where it was loaded in memory.

The UBL can be built in CCS using the project found in the PSP, or in Linux with the makefiles found with the serial flasher tool. UBOOT can also be rebuilt with the code in teh PSP.

Jeff

Thank you very much Jeff,

Is there a way to flash my Linux kernel image and file system without touching existing UBL and UBOOT?
The serial flasher wiki talks only about loading UBL and application binary (which could be UBL).

How would one go about storing Linux kernel image, file sytem and audioSoc application to flash?
What has to be changed then in UBOOT "bootargs" to boot this Linux image from flash?
As I mentioned earlier I want to run audioSoc application without being connected to host PC.

Regards,

Alija