enable LL (Low Level Debugging 後): /toolchain/arm-eabi-4.4.3/bin/arm-eabi-gcc -Wp,-MD,arch/arm/kernel/.debug.o.d -nostdinc -isystem /toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/include -I/kernel_imx/arch/arm/include -Iinclude -include include/generated/autoconf.h -D__KERNEL__ -mlittle-endian -Iarch/arm/mach-mx5/include -Iarch/arm/plat-mxc/include -D__ASSEMBLY__ -mabi=aapcs-linux -mno-thumb-interwork -funwind-tables -D__LINUX_ARM_ARCH__=7 -march=armv7-a -include asm/unified.h -msoft-float -c -o arch/arm/kernel/debug.o arch/arm/kernel/debug.S /toolchain/arm-eabi-4.4.3/bin/arm-eabi-gcc -Wp,-MD,arch/arm/mm/.iomap.o.d -nostdinc -isystem /toolchain/arm-eabi-4.4.3/bin/../lib/gcc/arm-eabi/4.4.3/include -I/kernel_imx/arch/arm/include -Iinclude -include include/generated/autoconf.h -D__KERNEL__ -mlittle-endian -Iarch/arm/mach-mx5/include -Iarch/arm/plat-mxc/include -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -Os -marm -mabi=aapcs-linux -mno-thumb-interwork -funwind-tables -D__LINUX_ARM_ARCH__=7 -march=armv7-a -msoft-float -Uarm -Wframe-larger-than=1024 -fno-stack-protector -fomit-frame-pointer -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(iomap)" -D"KBUILD_MODNAME=KBUILD_STR(iomap)" -c -o arch/arm/mm/.tmp_iomap.o arch/arm/mm/iomap.c arch/arm/kernel/debug.S: Assembler messages: arch/arm/kernel/debug.S:167: Error: garbage following instruction -- `ldrne r3,=MX51_AIPS1_IO_ADDRESS(MX51_UART1_BASE_ADDR)' arch/arm/kernel/debug.S:183: Error: garbage following instruction -- `ldrne r3,=MX51_AIPS1_IO_ADDRESS(MX51_UART1_BASE_ADDR)' make[1]: *** [arch/arm/kernel/debug.o] Error 1 make: *** [arch/arm/kernel] Error 2 make: *** Waiting for unfinished jobs.... trace debug.S :167 addruart r3, r1 addruart 定義在 debug-macro.S: .macro addruart, rx, tmp mrc p15, 0, \rx, c1, c0 tst \rx, #1 @ MMU enabled? ldreq \rx, =UART_PADDR @ physical ldrne \rx, =UART_VADDR @ virtual 所以是 UART_VADDR 的定義： (debug-macro.S): #include #define UART_PADDR MX51_UART1_BASE_ADDR #define UART_VADDR MX51_AIPS1_IO_ADDRESS(MX51_UART1_BASE_ADDR) 的 MX51_AIPS1_IO_ADDRESS( ) 沒有展開 (定義)。
這個是定義在 mx51.h。
用 git blame 找一下 debug-macro.S ，發現原來是 include mx51.h ，後來在新增 mx5x.h 後，才改為 include mx51.h..

改回去就 build OK...
... 但是..

在 boot argument 加上 earlyprintk 後，bootmessage 在 Uncompressing Linxu... done, booting the kernel. 後，就沒有 message 了...