Decouple SoftDevice and self uf2

hathach commented 4 years ago

Is your feature request related to a problem? Please describe. Decouple softdevice along with adding self uf2. There is a duplicate issue of some sort, but I create this new one anyway.

Describe the solution you'd like UF2 can be used to upgrade

Bootloader (family ID = 0xd663823c) , with check for BOOTLOADER ID in cf2
Application and/or SoftDevice (family ID = 0xADA52840)

For UF2 Softdevice can be bundled together ~~with either bootloader or~~ application into a single UF2 file.

CDC interface will left as it is as fail-safe since CDC can be used to revert to good-old version, should something bad happens.

Note: MBR is required to work with and without Softdevice (dynamically). MBR ROM & RAM requirement is as follows:

Flash 0x0000 - 0x1000 (first page)
RAM 0x20000000-0x20000008 ( first 8 bytes).

Check list

[x] uf2 works with or without a SD on the flash
[x] uf2 works with application only
[x] uf2 works with softdevice only
[x] uf2 works with application + softdevice
[x] uf2 works with bootloader only
[x] uf2 only update bootloader of the same board (using BOARD ID in cf2 config)
[x] uf2 work with CURRENT.UF2 read from device
~~[ ] uf2 works with bootloader + softdevice~~
[x] cdc works with application as it does now
[x] cdc works with bootloader + softdevice as it does now
[ ] ota should work when SD is on the flash: not tested, but should not change. This is subject to change in the next bootloader update

@dhalbert for review/discuss

hathach commented 4 years ago

@orrmany please don't hijack this issue which is about decoupling Softdevice, you could ask S340 related issue on your own issue/pr.

orrmany commented 4 years ago

Oh, I thought that checklist is a questionnaire. I have deleted the offending comment here

orrmany commented 4 years ago

@hathach : how do you plan to handle the differences among the RAM allocation needs with/without softdevice? And the RAM allocations differences between alternative softdevices?

hathach commented 4 years ago

@hathach : how do you plan to handle the differences among the RAM allocation needs with/without softdevice? And the RAM allocations differences between alternative softdevices?

It is application specific and have nothing to do with the bootloader.

hathach commented 4 years ago

implemented by #128

adafruit / Adafruit_nRF52_Bootloader

Decouple SoftDevice and self uf2 #126