[Ovmsdev] 3.1.005

[Mark Webb-Johnson]

Not really sure why Espressif ‘make flash’ doesn’t switch OTA partition back to factory. That would seem to be a sensible approach.

Good to hear it is back. There is also ‘make erase_flash’, but that is a bit drastic.

Regards, Mark.

> On 2 May 2018, at 8:32 AM, Stephen Casner <casner at acm.org> wrote:
> 
> Mark,
> 
>> I only built the OTA for v3.1 hardware. Do you think we need it for
>> v3.0 ongoing? I assumed developers would build their own.
> 
> No.  This was just a mistake by me not thinking clearly.
> 
>> I think you’ve OTA updated the v3.1 firmware onto v3.0 hardware, and
>> that is causing your issue. The ‘make flash’ command will flash the
>> factory partition, but it won’t switch the currently active boot
>> partition to factory.
> 
> Aha.
> 
>> I found this in the mailing list archive:
>> 
>> Supposedly if the OTA partition doesn’t boot (or checksum mismatch,
>> etc), the bootloader will boot factory.
>> 
>> The selection of current boot partition is in the otadata partition:
>> 
>> # OVMS 16MB flash ESP32 Partition Table
>> # Name,   Type, SubType, Offset,   Size
>> nvs,      data, nvs,     0x9000,  0x4000
>> otadata,  data, ota,     0xd000,  0x2000
>> phy_init, data, phy,     0xf000,  0x1000
>> factory,  app,  factory, 0x10000,  4M
>> ota_0,    app,  ota_0,   ,         4M
>> ota_1,    app,  ota_1,   ,         4M
>> store,    data, fat,     ,         1M
>> 
>> I guess zapping that would reset to defaults (factory boot)? I think
>> erase_region may do that:
>> 
>> esptool.py erase_region 0xd000 0x2000
> 
> I decided to zap the ota_0 partition instead:
> 
> $IDF_PATH/components/esptool_py/esptool/esptool.py erase_region 0x410000 0x400000
> 
> I had to "sudo ln -s /dev/tty.SLAB_USBtoUART /dev/ttyUSB0" first for
> this to work.  This did let the factory partition boot.
> 
>                                                        -- Steve_______________________________________________
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