Support for ESP32-C3 with 2M Flash
Port, board and/or hardware
ESP32-C3
MicroPython version
1.26.1
Reproduction
Write micropython version 1.26.1 to esp32-c3 2m flash version.
Expected behaviour
Normal boot.
Observed behaviour
ELF file SHA256: 200e18227
Rebooting...
ESP-ROM:esp32c3-api1-20210207
Build:Feb 7 2021
rst:0xc (RTC_SW_CPU_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x403807d2
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd5820,len:0xd9c
load:0x403cc710,len:0x9ac
load:0x403ce710,len:0x2c3c
entry 0x403cc710
E (348) spi_flash: Detected size(2048k) smaller than the size in the binary image header(4096k). Probe failed.
A fatal error occurred. The crash dump printed below may be used to help
determine what caused it. If you are not already running the most recent
version of MicroPython, consider upgrading. New versions often fix bugs.
To learn more about how to debug and/or report this crash visit the wiki
page at: https://github.com/micropython/micropython/wiki/ESP32-debugging
MPY version : v1.26.1 on 2025-09-11
IDF version : v5.4.2
Machine : ESP32C3 module with ESP32C3
Guru Meditation Error: Core 0 panic'ed (Load access fault). Exception was unhandled.
Core 0 register dump:
MEPC : 0x420298fe RA : 0x420298f2 SP : 0x3fca4bc0 GP : 0x3fc98800
TP : 0x3fca4c30 T0 : 0xffffffff T1 : 0x7f7f7f7f T2 : 0xffffffff
S0/FP : 0x3fca1000 S1 : 0x3c175000 A0 : 0x00000000 A1 : 0x00000000
A2 : 0x00000801 A3 : 0x00000080 A4 : 0x00000001 A5 : 0x600c2000
A6 : 0x3fc9d958 A7 : 0xeee984d6 S2 : 0x00000000 S3 : 0x00200000
S4 : 0x00000000 S5 : 0x00000000 S6 : 0x00000000 S7 : 0x00000000
S8 : 0x00000000 S9 : 0x00000000 S10 : 0x00000000 S11 : 0x00000000
T3 : 0x00000000 T4 : 0x0079726f T5 : 0x161b8fab T6 : 0x00000000
MSTATUS : 0x00001881 MTVEC : 0x40380001 MCAUSE : 0x00000005 MTVAL : 0x00000014
MHARTID : 0x00000000
Stack memory:
3fca4bc0: 0x00000000 0x00000000 0x3c171000 0x00000000 0x00000000 0x00000000 0x3c171000 0x42029938
3fca4be0: 0x3c170fc0 0x00000000 0x20000000 0x42165896 0x00000000 0x00001388 0x00000000 0x00000000
3fca4c00: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4c20: 0x00000000 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0x00000160 0x3fca4b90
3fca4c40: 0x00000000 0x3fc9b070 0x3fc9b070 0x3fca4c3c 0x3fc9b068 0x00000018 0x00000000 0x00000000
3fca4c60: 0x3fca4c3c 0x00000000 0x00000001 0x3fca3e38 0x6e69616d 0x00000000 0x00000000 0x00000000
3fca4c80: 0x3fca4c30 0x00000001 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4ca0: 0x3fca282c 0x3fca2894 0x3fca28fc 0x00000000 0x00000000 0x00000001 0x00000000 0x00000000
3fca4cc0: 0x00000000 0x42004c6c 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4ce0: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4d00: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4d20: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4d40: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4d60: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
3fca4d80: 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0xd648e5cb 0x3fca4c34 0x00000600
3fca4da0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4dc0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4de0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4e00: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4e20: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4e40: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4e60: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4e80: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4ea0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4ec0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4ee0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4f00: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4f20: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4f40: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4f60: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4f80: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
3fca4fa0: 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5 0xa5a5a5a5
Additional Information
I saw that 1.26.0 has update:
Most ESP32-based boards now auto-detect the size of their flash on boot and automatically create an appropriate vfs partition based on the size of the flash. This allows the same firmware image to work on boards with various flash sizes.
But on my esp32-c3 2M Flash, failed.
Code of Conduct
Yes, I agree
Bootloop when using 64MBit flash with ESP8266
Port, board and/or hardware
ESP8266 ESP-07 with W25Q64F
MicroPython version
ESP8266_GENERIC-FLASH_2M_ROMFS-20250415-v1.25.0.bin
ESP8266_GENERIC-FLASH_1M-20250415-v1.25.0.bin
ESP8266_GENERIC-OTA-20250415-v1.25.0.bin
ESP8266_GENERIC-20250415-v1.25.0.bin
Reproduction
programmed with the following commands:
esptool --port COM3 --baud 115200 write_flash --erase-all --flash_size=detect -fm dout 0 ESP8266_GENERIC-FLASH_2M_ROMFS-20250415-v1.25.0.bin
esptool.py v4.8.1
Serial port COM3
Connecting....
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting...
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: 18:fe:34:9d:5c:bb
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 8MB
Erasing flash (this may take a while)...
Chip erase completed successfully in 16.0s
Flash params set to 0x0380
Compressed 639680 bytes to 428052...
Wrote 639680 bytes (428052 compressed) at 0x00000000 in 37.8 seconds (effective 135.5 kbit/s)...
Hash of data verified.
Expected behaviour
No response
Observed behaviour
Initially starts with the message: "Writing init data" and then bootloops forever.
ets Jan 8 2013,rst cause:2, boot mode:(3,0)
load 0x40100000, len 31264, room 16
tail 0
chksum 0x7a
load 0x3ffe8000, len 1060, room 8
tail 12
chksum 0xc8
ho 0 tail 12 room 4
load 0x3ffe8430, len 1124, room 12
tail 8
chksum 0x2b
csum 0x2b
Writing init data
rf_cal[0] !=0x05,is 0xFF
ets Jan 8 2013,rst cause:2, boot mode:(3,0)
load 0x40100000, len 31264, room 16
tail 0
chksum 0x7a
load 0x3ffe8000, len 1060, room 8
tail 12
chksum 0xc8
ho 0 tail 12 room 4
load 0x3ffe8430, len 1124, room 12
tail 8
chksum 0x2b
csum 0x2b
rf_cal[0] !=0x05,is 0xFF
....
....
Additional Information
No, I've provided everything above.
Code of Conduct
Yes, I agree