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| author | Shawn Guo <shawn.guo@linaro.org> | 2013-05-12 17:22:17 +0800 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@linaro.org> | 2013-10-21 09:11:07 +0800 |
| commit | c7c3eac6277bc60fb4472a16c5af5d54afc83596 (patch) | |
| tree | d5adc61fddb818e903eeb617d6f2e8c5a560f763 /arch | |
| parent | 4c1dd3e5edc1619199b4a42618169ac3ac457cb5 (diff) | |
| download | lwn-c7c3eac6277bc60fb4472a16c5af5d54afc83596.tar.gz lwn-c7c3eac6277bc60fb4472a16c5af5d54afc83596.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig.debug | 8 | ||||
| -rw-r--r-- | arch/arm/include/debug/vf.S | 26 |
2 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 9762c84b4198..d597c6b8488b 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -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" diff --git a/arch/arm/include/debug/vf.S b/arch/arm/include/debug/vf.S new file mode 100644 index 000000000000..ba12cc44b2cb --- /dev/null +++ b/arch/arm/include/debug/vf.S @@ -0,0 +1,26 @@ +/* + * 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 |