[Ovmsdev] 3.1.005

Stephen Casner casner at acm.org
Wed May 2 08:32:43 HKT 2018


> 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.


> 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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