I’m able to get the default build to work using the Docker container (https://hub.docker.com/r/sinovoip/bpi-build/) and this Git repo: https://github.com/BPI-SINOVOIP/BPI-M3-bsp
However, as soon as I change the kernel options and set the mass storage device gadget as a module and try to build I get:
WARNING: modpost: Found 23 section mismatch(es).
To see full details build your kernel with:
‘make CONFIG_DEBUG_SECTION_MISMATCH=y’
GEN .version
CHK include/generated/compile.h
UPD include/generated/compile.h
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1
drivers/built-in.o: In function `sunxi_udc_irq’:
clk-ac100.c:(.text+0x19c8e8): undefined reference to `vfs_read_flag’
clk-ac100.c:(.text+0x19c8ec): undefined reference to `vfs_write_flag’
clk-ac100.c:(.text+0x19c8f0): undefined reference to `vfs_amount’
clk-ac100.c:(.text+0x19c8f4): undefined reference to `vfs_file_offset’
drivers/built-in.o: In function `udc_init’:
clk-ac100.c:(.init.text+0x8974): undefined reference to `vfs_read_flag’
clk-ac100.c:(.init.text+0x8978): undefined reference to `vfs_write_flag’
make[1]: *** [.tmp_vmlinux1] Error 1
make[1]: Leaving directory `/bananapi/BPI-M3-bsp/linux-sunxi’
make: *** [kernel] Error 2
Any suggestions?