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

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Date:   Fri, 16 Dec 2016 07:34:48 +0100
From:   Lukasz Majewski <l.majewski@...ess.pl>
To:     <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: 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


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