Add direct-boot support for ESP32-S3

[bjoernQ]

With this we can make use of the direct-boot feature of ESP32-S3.

Please note: We need a recent espflash executable to actually flash the binary

Fixes #39

[jessebraham]

Sorry if this is a silly question, but what am I missing here?

cargo +esp espflash --release --monitor --format=direct-boot --features=direct-boot --example=hello_world
[ ... ]
Finished release [optimized] target(s) in 40.97s
Chip type:         ESP32-S3
Crystal frequency: 40MHz
Flash size:        16MB
Features:          WiFi, BLE
MAC address:       7c:df:a1:e1:ae:30
Error: espflash::invalid_direct_boot

  × binary is not setup correct to support direct boot
  help: See the following page for documentation on how to setup your binary for direct boot:
        https://github.com/espressif/esp32c3-direct-boot-example

[bjoernQ]

Sorry if this is a silly question, but what am I missing here?

cargo +esp espflash --release --monitor --format=direct-boot --features=direct-boot --example=hello_world
[ ... ]
Finished release [optimized] target(s) in 40.97s
Chip type:         ESP32-S3
Crystal frequency: 40MHz
Flash size:        16MB
Features:          WiFi, BLE
MAC address:       7c:df:a1:e1:ae:30
Error: espflash::invalid_direct_boot

  × binary is not setup correct to support direct boot
  help: See the following page for documentation on how to setup your binary for direct boot:
        https://github.com/espressif/esp32c3-direct-boot-example

Are you using the espflash with today's changes?

[jessebraham]

Ahh I knew I was forgetting something haha, thanks. Flashes now but I get a backtrace:

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x7 (TG0WDT_SYS_RST),boot:0xa (SPI_FAST_FLASH_BOOT)
Saved PC:0x40050f3f
0x40050f3f - rom_config_instruction_cache_mode
    at ??:??
Guru Meditation Error: Core 0 panic'ed (LoadStoreError)
Core 0 register dump:
PC      : 0x42003f9a  PS      : 0x00060330  A0      : 0x8200389b  A1      : 0x3fcf5fc0
0x42003f9a - _ZN17compiler_builtins3mem6memcpy17h9357f21b7722a654E
    at ??:??
A2      : 0x4037de15  A3      : 0x3c005a15  A4      : 0x00000ca4  A5      : 0x00000000
0x4037de15 - _srwtext
    at ??:??
A6      : 0x00000000  A7      : 0x00000000  A8      : 0x00000003  A9      : 0x4037de18
0x4037de18 - _srwtext
    at ??:??
A10     : 0x00000003  A11     : 0x4037de15  A12     : 0x3c005a15  A13     : 0x00000003
0x4037de15 - _srwtext
    at ??:??
A14     : 0x00000000  A15     : 0x00000000  SAR     : 0x00000000  EXCCAUSE: 0x00000003
EXCVADDR: 0x4037de15  LBEG    : 0x42003f97  LEND    : 0x42003fa1  LCOUNT  : 0x00000002
0x4037de15 - _srwtext
    at ??:??
0x42003f97 - _ZN17compiler_builtins3mem6memcpy17h9357f21b7722a654E
    at ??:??
0x42003fa1 - _ZN17compiler_builtins3mem6memcpy17h9357f21b7722a654E
    at ??:??
Backtrace: 0x42003f9a:0x3fcf5fc0 0x42003898:0x3fcf5fe0 0x42000ec8:0x3fcf6000
0x42003f9a - _ZN17compiler_builtins3mem6memcpy17h9357f21b7722a654E
    at ??:??
0x42003898 - memcpy
    at ??:??
0x42000ec8 - startup_direct_boot
    at ??:??

(This repeats)

[bjoernQ]

Hmmm ... Maybe a wrong alignment? Will check that tomorrow - thanks a lot for testing

Could you try some other examples and maybe release vs debug builds?

[jessebraham]

The hello_world example works in dev but not release, same with hello_rgb. So it seems to be something to do with building with --release.

[bjoernQ]

That's very useful - thanks a lot!

[bjoernQ]

@jessebraham Should now work in both - release and development mode

[jessebraham]

Working for both profiles now, thanks!