Hello all,

I am new to u-boot and have played around by compiling for ARM and running with qemu (as found in may tutorials). However, the default configuration also includes network boot and I would like to reduce the configuration to the bare minimum.

I tried removing all networking support and network related boot commands with

$ make menuconfig

however, I get the following error:

In file included from include/configs/vexpress_common.h:174:0, from include/configs/vexpress_ca9x4.h:14, from include/config.h:5, from include/common.h:20, from env/common.c:10: include/config_distro_bootcmd.h:333:2: error: expected ‘}’ before ‘BOOT_TARGET_DEVICES_references_PXE_without_CONFIG_CMD_DHCP_or_PXE’ BOOT_TARGET_DEVICES_references_PXE_without_CONFIG_CMD_DHCP_or_PXE ^ include/config_distro_bootcmd.h:333:2: note: in definition of macro ‘BOOTENV_DEV_NAME_PXE’ BOOT_TARGET_DEVICES_references_PXE_without_CONFIG_CMD_DHCP_or_PXE ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/configs/vexpress_common.h:172:9: note: in expansion of macro ‘BOOTENV_DEV_NAME’ func(PXE, pxe, na) \ ^~~~ include/config_distro_bootcmd.h:339:18: note: in expansion of macro ‘BOOT_TARGET_DEVICES’ "boot_targets=" BOOT_TARGET_DEVICES(BOOTENV_DEV_NAME) "\0" ^~~~~~~~~~~~~~~~~~~ include/config_distro_bootcmd.h:356:2: note: in expansion of macro ‘BOOTENV_BOOT_TARGETS’ BOOTENV_BOOT_TARGETS \ ^~~~~~~~~~~~~~~~~~~~ include/configs/vexpress_common.h:199:17: note: in expansion of macro ‘BOOTENV’ BOOTENV \ ^~~~~~~ include/env_default.h:111:2: note: in expansion of macro ‘CONFIG_EXTRA_ENV_SETTINGS’ CONFIG_EXTRA_ENV_SETTINGS ^~~~~~~~~~~~~~~~~~~~~~~~~

Of course, the error indicates that the network boot is somehow available but not the required boot commands. However, I do not understand how to disable the network boot completely and how to use the BOOT_TARGET_DEVICES variable.

Please let me know what references I should read to learn more about this topic.

Thanks and best regards, Alexandru N. Onea