Building firmware fails

[twam]

I tried to build the firmware as described on http://glasgow-embedded.org/latest/develop/firmware.html with macOS and Gentoo Linux. On both systems it fails with:

$ make -C vendor/libfx2/firmware
make: Entering directory '/home/twam/glasgow/vendor/libfx2/firmware'
make[1]: Entering directory '/home/twam/glasgow/vendor/libfx2/firmware/library'
make[1]: Leaving directory '/home/twam/glasgow/vendor/libfx2/firmware/library'
make[1]: Entering directory '/home/twam/glasgow/vendor/libfx2/firmware/boot-cypress'
make[1]: *** No rule to make target 'build/main.rel', needed by 'boot-cypress.ihex'.  Stop.
make[1]: Leaving directory '/home/twam/glasgow/vendor/libfx2/firmware/boot-cypress'
make: *** [Makefile:4: all] Error 2
make: Leaving directory '/home/twam/glasgow/vendor/libfx2/firmware'

Any hints how to solve it?

[whitequark]

That's odd. Does ./software/deploy-firmware.sh work?

[twam]

I don't have a running docker setup for now. :)

I found out, that sdcc list the following changes in the manual:

• In 4.2.9, support for arguments to -MMD was dropped. The output file can be specified via -MF instead.

and I'm running sdcc 4.4.0. This explains why

 sdcc -mmcs51 --iram-size 0x100 --code-size 0x3e00 --xram-loc  0x3e00 --xram-size 0x0200 --std-sdcc99 --model-small  -I../library/include -L../library/lib/small -Wp,-MQ,build/main.rel,-MMD,build/main.d -c main.c

always deleted main.c resulting in the described the failure. Replacing the -MMD with -M,-MF makes the firmware build, but with a lot of

at 1: warning 190: ISO C forbids an empty translation unit

Flashing the created (and almost empty) firmware.ihex bricked my Glasgow 🙈

[whitequark]

I found out, that sdcc list the following changes in the manual:

• In 4.2.9, support for arguments to -MMD was dropped. The output file can be specified via -MF instead.

Ah, that would be whitequark/libfx2#11. We need to update the libfx2 submodule.

Flashing the created (and almost empty) firmware.ihex bricked my Glasgow 🙈

That's not an issue. Look at the PCB to the left of the reset button; there will be two (tiny) holes with "RECOVER" written on silk next to them. Short them with tweezers or something, and plug Glasgow again. After that, it will enumerate as a generic Cypress device and you'll be able to reflash it.

Make a backup of your EEPROM to make sure you retain the serial number, which can be done with the fx2tool command.

(Ideally we should have a documentation page on this, since I've omitted some details I've assumed you can figure out.)