fbusb compilation errors for Raspberry Pi Zero 2 W (Bookworm lite)

[jbird60]

Attempting to compile fbusb as per the guide leads to make errors.

carpi@carpi:~/vocore2/utils/fbusb/src $ make -C /usr/src/linux-headers-`uname -r`/ M=`pwd` modules # compile
make: Entering directory '/usr/src/linux-headers-6.6.28+rpt-rpi-v8'
  CC [M]  /home/carpi/vocore2/utils/fbusb/src/fbusb.o
/home/carpi/vocore2/utils/fbusb/src/fbusb.c: In function ‘fbusb_pause_show’:
/home/carpi/vocore2/utils/fbusb/src/fbusb.c:300:31: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=]
  300 |         return sprintf(buf, "%d\n", uinfo->pause);
      |                              ~^     ~~~~~~~~~~~~
      |                               |          |
      |                               int        long int
      |                              %ld
/home/carpi/vocore2/utils/fbusb/src/fbusb.c: In function ‘fbusb_probe’:
/home/carpi/vocore2/utils/fbusb/src/fbusb.c:479:23: error: ‘FBINFO_DEFAULT’ undeclared (first use in this function)
  479 |         info->flags = FBINFO_DEFAULT | FBINFO_VIRTFB;
      |                       ^~~~~~~~~~~~~~
/home/carpi/vocore2/utils/fbusb/src/fbusb.c:479:23: note: each undeclared identifier is reported only once for each function it appears in
/home/carpi/vocore2/utils/fbusb/src/fbusb.c: In function ‘fbusb_pause_store’:
/home/carpi/vocore2/utils/fbusb/src/fbusb.c:308:9: warning: ignoring return value of ‘kstrtol’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  308 |         kstrtol(buf, 10, &uinfo->pause);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [/usr/src/linux-headers-6.6.28+rpt-common-rpi/scripts/Makefile.build:248: /home/carpi/vocore2/utils/fbusb/src/fbusb.o] Error 1
make[1]: *** [/usr/src/linux-headers-6.6.28+rpt-common-rpi/Makefile:1938: /home/carpi/vocore2/utils/fbusb/src] Error 2
make: *** [/usr/src/linux-headers-6.6.28+rpt-common-rpi/Makefile:246: __sub-make] Error 2
make: Leaving directory '/usr/src/linux-headers-6.6.28+rpt-rpi-v8'
carpi@carpi:~/vocore2/utils/fbusb/src $ 

Device is a Raspberry Pi Zero 2 W, distro is 64-bit Pi OS lite (Bookworm).

[Vonger]

Seems like the new kernel changed define. need to patch. Also you can try our DRM driver.

[ieiao]

Hi, currently MPRO screen(Vocore2 Display) has provided DRM driver support, which is easier to use than fb driver. You can get the latest driver and usage from here.

To use this driver properly, please make sure your screen firmware already supports the partially draw.