fix: use proper bootloader commands for ESP8266#2
Merged
deadprogram merged 1 commit intomainfrom Feb 27, 2026
Merged
Conversation
The ESP8266 ROM bootloader doesn't support two commands that were being used: CHANGE_BAUD (0x0F) - baud rate switching is ESP32+ only. Now skipped for ESP8266, so flashing runs at the default 115200 baud. Compressed flash commands (0x10-0x12) - FLASH_DEFL_BEGIN/DATA/END are ESP32+ ROM commands. Now falls back to uncompressed FLASH_BEGIN/DATA/END (0x02-0x04) for ESP8266. Both features are gated by new ROMHasChangeBaud and ROMHasCompressedFlash flags in chipDef. All ESP32 variants have them set to true and ESP8266 defaults to false. Signed-off-by: deadprogram <ron@hybridgroup.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The ESP8266 ROM bootloader doesn't support two commands that were being used:
CHANGE_BAUD (0x0F) - baud rate switching is ESP32+ only. Now skipped for ESP8266, so flashing runs at the default 115200 baud.
Compressed flash commands (0x10-0x12) - FLASH_DEFL_BEGIN/DATA/END are ESP32+ ROM commands. Now falls back to uncompressed FLASH_BEGIN/DATA/END (0x02-0x04) for ESP8266.
Both features are gated by new ROMHasChangeBaud and ROMHasCompressedFlash flags in chipDef. All ESP32 variants have them set to true and ESP8266 defaults to false.