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machine/esp32c3: implement BlockDevice for esp32c3 flash

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- Add `machine_esp32c3_flash.go` to implement the `BlockDevice` interface for ESP32-C3.
- Map internal ESP ROM SPI flash and cache invalidation functions via CGo.
- Update `targets/esp32c3.ld` to expose `__flash_data_start` and `__flash_data_end` linker variables.
- Add `esp32c3` to build tags in `src/machine/flash.go`.
- Ensure atomic flash operations by disabling interrupts and invalidating cache to prevent stale reads.

Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram
2026-03-29 10:47:33 +02:00
parent f748dc6fd8
commit c2a04e1a45
3 changed files with 142 additions and 1 deletions
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src/machine/flash.go
+1 -1
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@@ -1,4 +1,4 @@
//go:build nrf || nrf51 || nrf52 || nrf528xx || stm32f4 || stm32l0 || stm32l4 || stm32wlx || atsamd21 || atsamd51 || atsame5x || rp2040 || rp2350
//go:build esp32c3 || nrf || nrf51 || nrf52 || nrf528xx || stm32f4 || stm32l0 || stm32l4 || stm32wlx || atsamd21 || atsamd51 || atsame5x || rp2040 || rp2350
package machine