Using appfs on latest ESP-IDF

[renzenicolai]

Hi Jeroen,

I've tried to port appfs to the latest ESP-IDF for use on the MCH2022 event badge.

The application side works now and I can store files in the appfs partition, however my attempt at adding appfs support to the latests bootloader version results in a crash.

My attempt can be found here:

https://github.com/badgeteam/mch2022-firmware-esp32/blob/appfs-bootloader/factory_test/bootloader_components/my_boot_hooks/hooks.c

The appfs partition and the app to be started are found and sections are being loaded, however during the loading process a fatal exception occurs, probably because the code snippets I copied over from this repository don't match the methods found in the latest bootloader version.

The log:

E (2473) main: booting gnuboy from appfs
I (13) boot: ESP-IDF v5.0-dev-914-g5624dffc52 2nd stage bootloader
I (14) boot: chip revision: 3
I (14) qio_mode: Enabling default flash chip QIO
I (18) boot.esp32: SPI Speed      : 80MHz
I (23) boot.esp32: SPI Mode       : QIO
I (27) boot.esp32: SPI Flash Size : 16MB
I (32) boot: Enabling RNG early entropy source...
W (37) appfsboot: AppFS boot
I (41) appfsboot: End of partition table
I (45) appfsboot: AppFs found
I (57) appfs: Meta page 0: invalid (serial 0)
I (57) appfs: Meta page 1: valid (serial 7)
I (59) appfs: Using page 1 as current.
I (63) appfsboot: Trying to boot gnuboy as indicated by RTC mem...
I (70) appfs: File 0 has 8 pages.
I (74) appfs: Mapping flash addr 320000 to mem addr 3F400000 for page 0
I (81) appfs: Mapping flash addr 330000 to mem addr 3F410000 for page 1
I (89) appfs: Mapping flash addr 340000 to mem addr 3F420000 for page 2
I (96) appfs: Mapping flash addr 350000 to mem addr 3F430000 for page 3
I (103) appfs: Mapping flash addr 360000 to mem addr 3F440000 for page 4
I (111) appfs: Mapping flash addr 370000 to mem addr 3F450000 for page 5
I (118) appfs: Mapping flash addr 380000 to mem addr 3F460000 for page 6
I (125) appfs: Mapping flash addr 390000 to mem addr 3F470000 for page 7
I (133) appfsboot: Segment 0: map to 3F400020 size 3E95C
I (139) appfsboot: Segment 1: load to 3FFB0000 size 1694
I (145) appfsboot: Segment 2: map to 400D0020 size 23CE0
I (151) appfsboot: Segment 3: load to 3FFB1694 size F40
I (157) appfsboot: Segment 4: load to 40080000 size 18184
Fatal exception (0): IllegalInstruction
epc1=0x40080a30, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x00000000

I hope you find the time to have a quick look into this as I think having appfs support on the latest ESP-IDF might be useful for more people than just me and my project.

Greetings,
Renze