Defines starting with `b' in arch/i386/netboot

• B_ARG0 arch/i386/netboot/asm.h:49
• B_ARG1 arch/i386/netboot/asm.h:50
• B_ARG2 arch/i386/netboot/asm.h:51
• B_ARG3 arch/i386/netboot/asm.h:52
• BOARD_16BIT arch/i386/netboot/wd80x3.c:40
• BOOTREPLY arch/i386/netboot/bootp.h:59
• BOOTREQUEST arch/i386/netboot/bootp.h:60
• BRK_INTR arch/i386/netboot/param.h:27