TM4C123GE6PM: Can you tell segger jlink only erase necessary flash

Robert Valentine

Part Number: TM4C123GE6PM
Other Parts Discussed in Thread: SEGGER, UNIFLASH

Hello,

I'm programming a TM4C123 part with a segger Jlink and I have a bootloader programmed first, then my application. I noticed with CCS and the ICDI on the launchpad I can tell the ICDI to only erase my application code space which is offset from the bootloader so the bootloader doesn't get erased.

Can you do this when CCS is using the segger Jlink programmer? It seems that my bootloader is getting erased and I don't see the settings to tell CCS debugger to only erase my application code space like the ICDI allows you to do. For the ICDI this option was in the Debug settings, but when using the segger jlink the option isn't there.

Thanks

over 1 year ago

0 Charles Tsai over 1 year ago

TI__Guru**** 190616 points

Hi Robert,

If you are trying to program your application starting at an offset (e.g. 0x2800) using JTAG and wanted to avoid erasing the bootloader at 0x0 then you can select the 'Necessary Page Only' for the Erase Option. See below. Or you can also specify the range of the addresses that you want to program and erase. You can also use Uniflash where you can specify multiple program images (e.g. a bootloader at 0x0 and the application at 0x2800) to be loaded at the same time.

0 Robert Valentine over 1 year ago in reply to Charles Tsai

Prodigy 205 points

Hi Charles,

How do you get the "On Chip Flash" tab?

0 Charles Tsai over 1 year ago in reply to Robert Valentine

TI__Guru**** 190616 points

Hi Robert,

Under the Tools tab, you can find the On-Chip Flash.

0 Robert Valentine over 1 year ago in reply to Charles Tsai

Prodigy 205 points

I'm sure I'm missing something obvious but where is tools. My tool bar doesn't have "tools".

I'm on CCS v9.2

Screenshot of my toolbar below

I have tools under the debug perspective but no "On Chip Flash" option. What version of CCS are you running?

0 Charles Tsai over 1 year ago in reply to Robert Valentine

TI__Guru**** 190616 points

Hi Robert,

I think that may have something to do with the debug probe you are using which is Jlink. Can you try with a XDS or ICDI debug probe if you have one (e.g. XDS110, XDS200). One quick thing you can check is to connect to a LaunchPad which has a on-board ICDI debug probe.

0 Robert Valentine over 1 year ago in reply to Charles Tsai

Prodigy 205 points

I think you are right. I will fall back to ICDI.

THanks Charles!

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TM4C123GE6PM: Can you tell segger jlink only erase necessary flash