Can not erase flash by nrf_fstorage_sd backend

RE: Can not erase flash by nrf_fstorage_sd backend

Macrus_Li — Fri, 12 Nov 2021 06:30:22 GMT

Hi Kenneth

I think I found the reason that why I can not erase the address after 0x73000 where my bootloader start at.

The problem is in my own bootloader. Before jump into application, the bootloader will call nrf_bootloader_flash_protect to protect the bootloader area, so when application wants to erase bootloader, it trigger the cpu hardfault and the erase was failed of course.
And because using debug tool will let DISABLEINDEBUG register disable the protect, that's also why
I can erase the bootloader when using debug mode on application.

Many thanks,
Marcus

RE: Can not erase flash by nrf_fstorage_sd backend

Macrus_Li — Thu, 11 Nov 2021 08:23:29 GMT

Hi Kenneth

Thanks for your reply and the documented you provide.

Now the API can erase flash include the bootloader, but it still a little bit weird.
When I used debug mode to check any wrong with erase process, everything is fine,
the API can erase all address in flash include bootloader address 0x73000.
But when I just download the program by using keil, it seems like never erase, the bootloader still in flash.

What's different between debug mode and download program?
should I check the any status before I erase?

Many thanks,
Marcus

RE: Can not erase flash by nrf_fstorage_sd backend

Kenneth — Tue, 09 Nov 2021 13:51:12 GMT

Hi Marcus,

This should be documented here:
https://infocenter.nordicsemi.com/topic/sds_s132/SDS/s1xx/mbr_bootloader/mbr_bootloader.html

Kenneth

RE: Can not erase flash by nrf_fstorage_sd backend

Macrus_Li — Tue, 09 Nov 2021 09:11:37 GMT

Hi Kenneth

Thanks for your reply.

My Bootloader is start at 0x73000.
For some reason, I need to erase my bootloader and upgrade it, that why I asked how does softdevice know I have bootloader in it.
And because the bootloader is build by my own, so it can not used DFU to upgrade it.

Does there any way to pass or bypass the examine and let me can erase the bootloader?

Many thanks,
Marcus

RE: Can not erase flash by nrf_fstorage_sd backend

Kenneth — Tue, 09 Nov 2021 08:38:49 GMT

Hi Marcus,

Thanks for sharing the error.

In terms of finding the end address, I suggest to do like FDS do it:

static uint32_t flash_end_addr(void)
{
    uint32_t const bootloader_addr = BOOTLOADER_ADDRESS;
    uint32_t const page_sz         = NRF_FICR->CODEPAGESIZE;

#if defined(NRF52810_XXAA) || defined(NRF52811_XXAA)
    // Hardcode the number of flash pages, necessary for SoC emulation.
    // nRF52810 on nRF52832 and
    // nRF52811 on nRF52840
    uint32_t const code_sz = 48;
#else
   uint32_t const code_sz = NRF_FICR->CODESIZE;
#endif

    uint32_t end_addr = (bootloader_addr != 0xFFFFFFFF) ? bootloader_addr : (code_sz * page_sz);

    return end_addr - (FDS_PHY_PAGES_RESERVED * FDS_PHY_PAGE_SIZE * sizeof(uint32_t));
}

The BOOTLOADER_ADDRESS is defined in start of app_util.h as:

#define BOOTLOADER_ADDRESS      ((*(uint32_t *)MBR_BOOTLOADER_ADDR) == 0xFFFFFFFF ? *MBR_UICR_BOOTLOADER_ADDR : *(uint32_t *)MBR_BOOTLOADER_ADDR) /**< The currently configured start address of the bootloader. If 0xFFFFFFFF, no bootloader start address is configured. */

In case some pages are reserved by other modules, then FDS also have a reserved pages define:

#define FDS_PHY_PAGES_RESERVED      ((FDS_VIRTUAL_PAGES_RESERVED * FDS_VIRTUAL_PAGE_SIZE) / FDS_PHY_PAGE_SIZE)

Best regards,
Kenneth

RE: Can not erase flash by nrf_fstorage_sd backend

Macrus_Li — Tue, 09 Nov 2021 07:49:07 GMT

Hi Kenneth

Thanks for your reply.

Sorry, it's my fault.

I test the example flash_fstorage with s132 and change the function nrf_fstorage_write to nrf_fstorage_erase, it works pretty good.So I compare all files include sdk_config.h, and I found that nRF_SoftDevice → NRF_SDH_ENABLE → Dispatch model → NRF_SDH_DISPATCH_MODEL need to be setting with NRF_SDH_DISPATCH_MODEL_INTERRUPT, not polling. And finally it works.

But I have another qusetion that when I erase the address after 0x73000, either example or my application are not work. Is it because I have bootloader on 0x73000?
How can softdevice know I have a bootloader in it?

Many thanks,
Marcus

RE: Can not erase flash by nrf_fstorage_sd backend

Kenneth — Mon, 08 Nov 2021 13:52:02 GMT

Maybe it's something wrong with registering the softdevice observer which should be handled in top of nrf_fstorage_sd.h:

/* Define a nrf_sdh_soc event observer to receive SoftDevice system events. */
NRF_SDH_SOC_OBSERVER(m_sys_obs, 0, nrf_fstorage_sys_evt_handler, NULL);

Maybe you are missing nrf_sdh_soc.c?

Best regards,
Kenneth