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86 lines
3.2 KiB
Diff
86 lines
3.2 KiB
Diff
From 70c30ca997919a4b8c9051a3903f30c79c735f12 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Wed, 5 Jun 2013 09:05:00 +0200
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Subject: [PATCH 030/203] arm: mvebu: add another earlyprintk Kconfig option
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In order to support both old and new bootloaders, we add a new Kconfig
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option for the earlyprintk UART selection. The existing option allows
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to work with old bootloaders (that keep the internal registers mapped
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at 0xd0000000), while the newly introduced option allows to work with
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new bootloaders (that remap the internal registers at 0xf1000000).
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Acked-by: Arnd Bergmann <arnd@arndb.de>
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Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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---
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arch/arm/Kconfig.debug | 30 ++++++++++++++++++++++++++++--
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arch/arm/include/debug/mvebu.S | 5 +++++
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2 files changed, 33 insertions(+), 2 deletions(-)
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--- a/arch/arm/Kconfig.debug
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+++ b/arch/arm/Kconfig.debug
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@@ -303,12 +303,37 @@ choice
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their output to the serial port on MSM 8960 devices.
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config DEBUG_MVEBU_UART
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- bool "Kernel low-level debugging messages via MVEBU UART"
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+ bool "Kernel low-level debugging messages via MVEBU UART (old bootloaders)"
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depends on ARCH_MVEBU
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help
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Say Y here if you want kernel low-level debugging support
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on MVEBU based platforms.
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+ This option should be used with the old bootloaders
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+ that left the internal registers mapped at
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+ 0xd0000000. As of today, this is the case on
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+ platforms such as the Globalscale Mirabox or the
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+ Plathome OpenBlocks AX3, when using the original
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+ bootloader.
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+
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+ If the wrong DEBUG_MVEBU_UART* option is selected,
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+ when u-boot hands over to the kernel, the system
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+ silently crashes, with no serial output at all.
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+
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+ config DEBUG_MVEBU_UART_ALTERNATE
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+ bool "Kernel low-level debugging messages via MVEBU UART (new bootloaders)"
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+ depends on ARCH_MVEBU
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+ help
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+ Say Y here if you want kernel low-level debugging support
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+ on MVEBU based platforms.
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+
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+ This option should be used with the new bootloaders
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+ that remap the internal registers at 0xf1000000.
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+
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+ If the wrong DEBUG_MVEBU_UART* option is selected,
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+ when u-boot hands over to the kernel, the system
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+ silently crashes, with no serial output at all.
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+
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config DEBUG_NOMADIK_UART
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bool "Kernel low-level debugging messages via NOMADIK UART"
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depends on ARCH_NOMADIK
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@@ -632,7 +657,8 @@ config DEBUG_LL_INCLUDE
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DEBUG_IMX51_UART || \
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DEBUG_IMX53_UART ||\
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DEBUG_IMX6Q_UART
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- default "debug/mvebu.S" if DEBUG_MVEBU_UART
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+ default "debug/mvebu.S" if DEBUG_MVEBU_UART || \
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+ DEBUG_MVEBU_UART_ALTERNATE
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default "debug/mxs.S" if DEBUG_IMX23_UART || DEBUG_IMX28_UART
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default "debug/nomadik.S" if DEBUG_NOMADIK_UART
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default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
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--- a/arch/arm/include/debug/mvebu.S
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+++ b/arch/arm/include/debug/mvebu.S
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@@ -11,7 +11,12 @@
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* published by the Free Software Foundation.
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*/
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+#ifdef CONFIG_DEBUG_MVEBU_UART_ALTERNATE
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+#define ARMADA_370_XP_REGS_PHYS_BASE 0xf1000000
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+#else
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#define ARMADA_370_XP_REGS_PHYS_BASE 0xd0000000
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+#endif
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+
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#define ARMADA_370_XP_REGS_VIRT_BASE 0xfec00000
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.macro addruart, rp, rv, tmp
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