topic Re: Segger J-Flash settings with K8x and QSPI in Kinetis Microcontrollers

Segger J-Flash settings with K8x and QSPI

deniscollis — Mon, 27 Sep 2021 20:23:59 GMT

I'm attempting to program a K81 and QSPI (Micron MT25QL128 - 16MB, single die). Segger J-Flash V7.54c shows error:

Timeout while preparing target, RAMCode did not respond in time. (PC = 0x00000000, CPSR = 0x00000000, LR = 0x61000000)!
Failed to prepare RAMCode using RAM
Error while determining flash info (Bank 1 @ 0x68000000)
Failed to auto program target

The J-Flash Project Info:

Has anyone encountered this, and can figure what's going on?

Thanks,
Denis

Re: Segger J-Flash settings with K8x and QSPI

nxf56274 — Tue, 28 Sep 2021 06:53:26 GMT

Hi,

When you use jFlash, you doesn't configure the QSPI. So the external ram can't be used.

Have a great day,

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Re: Segger J-Flash settings with K8x and QSPI

deniscollis — Tue, 05 Oct 2021 23:43:18 GMT

@nxf56274I'm not sure what you're saying. There is no external RAM, only the K81 with its onboard internal RAM.

As I understand the process, in order to write to the external QSPI flash, j-Flash/J-Link first downloads code to the MCU's internal RAM, sets the program counter and starts execution. Thereafter, J-Link/J-Flash sends instructions and data to the RAM resident code, which relays it to the external QSPI flash.

Thanks,
Denis

Re: Segger J-Flash settings with K8x and QSPI

deniscollis — Tue, 25 Jan 2022 18:23:37 GMT

J-Flash/J-Link V6.50a works perfectly. There's a bug in V7.45c, which I have reported to Segger.

Update Jan 20, 2022 from Segger:

Upcoming release of Segger J-Link/J-Flash will include fix for this issue.

The issue was due to a speed optimization that relied on the availability of an external reference clock, RTCK, which is not the case with many devices, including the NXP K8x.

Update Jan 25, 2022:

Segger J-Link/J-Flash V7.60f available for download. Fix for K8x issue included in this release.