Makefile hierarchy: CFLAGS override-ability actually works now The original version was broken in that CFLAGS=${CFLAGS} passing was done without quotes, which breaks as soon as there is a space in the user-set CFLAGS. Changing it to CFLAGS="${CFLAGS}" makes it work as originally intended.

main()
{
	uart_select_init();
	printf("SIM interface debug program running\n");
	print_boot_rom_info();
	for (;;) {
		putchar('=');
		if (command_entry())
			command_dispatch();
	}
}