Trouble with CMake and flash > 4 MB

[RobH]

Looks like I'm heading in the wrong direction (w.r.t. to the subject line).

As I mentioned earlier: my board has 4 MB flash. So I should not look for a solution with more flash memory.

When I load the pre-built GENERIC_SPIRAM firmware from the Micropython site I see (about) 4 MB with esp.flash_size() , 4 MB with gc.mem_free() and 2 MB free space with os.statvfs("//").

Having 8MB SPIRAM on board it seems that I have 4 MB more available. If I'm right I would like to know how to enable those 4 MB SPIRAM!

[rcolistete]

AFAIK, (official) MicroPython doesn't support 8MB of PSRAM in ESP32.

[RobH]

@rcolistete:
Thanks! It confirms what was already indicated by bertel.
So I'll have to consider the superfluous 4MB PSRAM for future use, if and whenever it might become supported.

[jetpax]

For those who had difficulty using Cmake with >4M flash, and ended up here per the original thread title, I found that adding the entire Serial flasher config stanza in my sdkconfig.board worked (after a make clean)

for me that was

Code: Select all

#
# Serial flasher config
#
CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
CONFIG_ESPTOOLPY_FLASHMODE="dio"
CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
CONFIG_ESPTOOLPY_FLASHFREQ="80m"
CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y
CONFIG_ESPTOOLPY_FLASHSIZE="16MB"
CONFIG_ESPTOOLPY_FLASHSIZE_DETECT=y
# end of Serial flasher config