From b0838a85d84525e58368a7c9ffd64922a6463910 Mon Sep 17 00:00:00 2001 From: Shawn Guo <shawn.guo@linaro.org> Date: Sun, 12 May 2013 17:22:17 +0800 Subject: [PATCH 30/59] 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: Shawn Guo <shawn.guo@linaro.org> --- arch/arm/Kconfig.debug | 8 ++++++++ arch/arm/include/debug/vf.S | 26 ++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) create mode 100644 arch/arm/include/debug/vf.S @ arch/arm/Kconfig.debug:389 @ 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 @ arch/arm/Kconfig.debug:916 @ 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:4 @ -- +/* + * 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 1.8.4.rc3