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Commit c7c3eac6 authored by Shawn Guo's avatar Shawn Guo
Browse files

ARM: imx: add low-level debug for vybrid 



Add low-level debug support for vybrid, so that earlyprintk can be
enabled for debugging early boot issue.

Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent 4c1dd3e5

arch/arm/Kconfig.debug

+8 −0
Original line number Diff line number Diff line
@@ -386,6 +386,13 @@ choice 
		  when u-boot hands over to the kernel, the system

		  silently crashes, with no serial output at all.



	config DEBUG_VF_UART

		bool "Vybrid UART"

		depends on SOC_VF610

		help

		  Say Y here if you want kernel low-level debugging support

		  on Vybrid based platforms.



	config DEBUG_NOMADIK_UART

		bool "Kernel low-level debugging messages via NOMADIK UART"

		depends on ARCH_NOMADIK
@@ -906,6 +913,7 @@ config DEBUG_LL_INCLUDE 
	default "debug/tegra.S" if DEBUG_TEGRA_UART

	default "debug/ux500.S" if DEBUG_UX500_UART

	default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT

	default "debug/vf.S" if DEBUG_VF_UART

	default "debug/vt8500.S" if DEBUG_VT8500_UART0

	default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1

	default "mach/debug-macro.S"

arch/arm/include/debug/vf.S

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2013 Freescale Semiconductor, Inc.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 */



	.macro	addruart, rp, rv, tmp

	ldr	\rp, =0x40028000	@ physical

	ldr	\rv, =0xfe028000	@ virtual

	.endm



	.macro	senduart, rd, rx

	strb	\rd, [\rx, #0x7]	@ Data Register

	.endm



	.macro	busyuart, rd, rx

1001:	ldrb	\rd, [\rx, #0x4]	@ Status Register 1

	tst	\rd, #1 << 6		@ TC

	beq	1001b			@ wait until transmit done

	.endm



	.macro	waituart,rd,rx

	.endm