Flashing kernel & ramdisk in SPI Flash using U-Boot

Jitendra Jagasia

Intellectual 840 points

Other Parts Discussed in Thread: AM1705

Hi,

I am currently working on AM1705 custom board. Our board have 64MB ram & 32 MB flash.

The memory Map of my Flash is given below:

ARM UBL is stored at: 0x00

U-Boot is stored at : 0x10000

U-Boot parameters is stored : 0x40000

Linux Kernel at : 0x60000

Ramdisk : 0x400000

I am using the following commands given below for writing to SPI flash

sf erase 0x60000 0x300000

tftp 0xC0700000 uImage

sf write 0xC0700000 0x60000 0x300000

sf read 0xC0700000 0x60000 0x300000

But when i am booting the kernel it is giving me Bad CRC error.

But sometimes when i re write the code in flash then it works properly

So I my case flashing of uImage works only 1 out of 20 times.

Similar case occur for ramdisk.

Can anyone provide me solution that how can I solve my above given issue.

Please revert back as soon as possible

Thanks & regards

Jitendra

over 14 years ago

0 jc-ti over 14 years ago

TI__Mastermind 27585 points

How did you flash U-boot onto the board? Can you try flashing the uImage the same way and seeing if that works?

Jeff

0 K Md Feroz Irfan over 14 years ago in reply to jc-ti

TI__Expert 7225 points

Hi Jeff,

We suspect the spi flash write code that may not be right for the used flash. It is not same as EVM flash. Can you review that code in u-boot?

They have tried the Jtag mode I think for burning u-boot and ubl. Can uImage be burnt using the same ccs project?

Also, the sf_xx.exe that works for EVM does not work on the custom board. Is there a way to give source code to modify it for the differnt serial flash used?

Best Regards

Feroz

0 jc-ti over 14 years ago in reply to K Md Feroz Irfan

TI__Mastermind 27585 points

The source for uBoot is included in the PSP. Have they tried modifying the board specific header files to match their specific SPI flash?

You can use the CCS tool and the serial flash tool to flash uImage, but keep in mind that the image must be transferred over UART at 115200 baud. For large sizes of uImage this might take a long time.

If you have a custom board, you need to rebuild the serial flashing tool. See this wiki for details on rebuilding and changes for custom boards: http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L138

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Flashing kernel & ramdisk in SPI Flash using U-Boot