CC2538: Unable to erase flash with Flash Control Registers

huyphamnhu

Prodigy 20 points

Part Number: CC2538

Hi,

I am trying to erase the CCA (0x0027F800) via OpenOCD by using Flash Control Registers.

Set the flash page to be erased in FLASH_CTRL_FADDR

mww 0x400D300C 0x1FE00

Enable UPPER_PAGE_ACCESS and start an erase operation by setting FCTL.ERASE bit to 1

mww 0x400D3008 0x205

But after that, the CCA flash page remain unchanged.

Can anybody help me or point out what I am doing wrong?

Details about Flash Control Registers can be found in https://www.ti.com/lit/ug/swru319c/swru319c.pdf, section 8.10

Thank you in advance.

over 5 years ago

0 Ryan Brown1 over 5 years ago

TI__Guru**** 222027 points

The CCA flash page is protected from write/erase to protect from being locked out:

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/610637
https://e2e.ti.com/support/wireless-connectivity/zigbee-and-thread/f/158/t/622384

What are you trying to accomplish and have you made any changes to startup_ewarm.c?

Regards,
Ryan

0 huyphamnhu over 5 years ago in reply to Ryan Brown1

Prodigy 20 points

All I'm trying to do is wipe the CCA flash page to force it into bootloader mode.

Could you please tell me where the CCA flash page write/erase protection of the CC2538 is doccumented?

In the CC2538_users_guide_swru319c I only saw LOCK_PAGE_N[n] (n from 0-254) while the CCA is page 255

To be honest, I don't have a clue about what startup_ewarm.c is. Just playing around with Flash Control Registers because I think if I set those registers, the flash memory can be modified directly.

For the record, I wired a CC2538 to few GPIO pins of a Raspberry Pi, established JTAG debug via OpenOCD.

0 Ryan Brown1 over 5 years ago in reply to huyphamnhu

TI__Guru**** 222027 points

You will need to use the JTAG interface to either force a mass erase or change the CCFG settings to trigger the bootloader based on a selected pin after reset:

https://www.ti.com/lit/swra466
https://www.ti.com/lit/swru333
https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/766790
https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/931617

Regards,
Ryan

Zigbee & Thread

Zigbee & Thread forum

CC2538: Unable to erase flash with Flash Control Registers