Problem with early debugging (arch/arm/boot/compressed/head.S)

Dear All,

My SoC: Cortex-A15, TI (AM57xx)

My setup: Linux v4.9: tag v4.9-rc8

Toolchain: TI's SDK:
ti-am572x-idk-sdk/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-

I'm trying to get early print messages on UART1 (0x4806a000).

Relevant .config defines:

CONFIG_DEBUG_LL=y
CONFIG_DEBUG_LL_INCLUDE="debug/omap2plus.S"
CONFIG_EARLY_PRINTK=y
CONFIG_DEBUG_OMAP2UART1=y

've enabled debugging in the arch/arm/boot/compressed/head.S file (#define DEBUG).

Unfortunately I do have following errors:

CC arch/arm/boot/compressed/decompress.o arch/arm/boot/compressed/head.S: Assembler messages:
arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- sub ,r3,r1' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- ldr r3,[,#0]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- ldr r1,[,#4]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- str r3,[,#0]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- str r3,[,#4]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- str r3,[,#8]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- str r3,[,#0]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- str r3,[,#4]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- str r3,[,#8]' arch/arm/boot/compressed/head.S:1286: Error: ARM register expected -- ldr ,[,#8]' arch/arm/boot/compressed/head.S:1286: Error: shift expression expected -- add r3,r3,' arch/arm/boot/compressed/head.S:1286: Error: shift expression expected -- add r1,r1,' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- sub ,r3,r1' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- ldr r3,[,#0]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- ldr r1,[,#4]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- str r3,[,#0]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- str r3,[,#4]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- str r3,[,#8]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- str r3,[,#0]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- str r3,[,#4]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- str r3,[,#8]' arch/arm/boot/compressed/head.S:1304: Error: ARM register expected -- ldr ,[,#8]' arch/arm/boot/compressed/head.S:1304: Error: shift expression expected -- add r3,r3,' arch/arm/boot/compressed/head.S:1304: Error: shift expression expected -- add r1,r1,' scripts/Makefile.build:393: recipe for target 'arch/arm/boot/compressed/head.o' failed

Those are related to loadsp macro (also defined in head.S file), which is very short:

.macro loadsp, rb, tmp

	        push {r7}
	        addruart r7, \rb, \tmp
	        pop {r7}
		.endm

Any ideas how to fix this issue? Any hints?

I initially thought that this is compiler configuration issue - but those errors are on many compilers (also incliding TI's SDK compiler).

Any ideas or hints how to proceed?

Best regards,

Łukasz Majewski