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49 lines
1.4 KiB
Diff
49 lines
1.4 KiB
Diff
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From a32285ed4ba970b868b7fb49b716d776f4410ef6 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Sat, 19 Mar 2016 16:52:46 +0100
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Subject: [PATCH] MIPS: lantiq: add support for device tree file from boot
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loader
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This fetches the device tree file like it is specified in the MIPS UHI
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interface if one was found. This is also used when the device tree file
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was appended to the kernel image with cat.
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This code is copied from arch/mips/bmips/setup.c.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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arch/mips/lantiq/prom.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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--- a/arch/mips/lantiq/prom.c
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+++ b/arch/mips/lantiq/prom.c
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@@ -65,6 +65,8 @@ static void __init prom_init_cmdline(voi
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void __init plat_mem_setup(void)
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{
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+ void *dtb;
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+
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ioport_resource.start = IOPORT_RESOURCE_START;
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ioport_resource.end = IOPORT_RESOURCE_END;
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iomem_resource.start = IOMEM_RESOURCE_START;
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@@ -72,11 +74,18 @@ void __init plat_mem_setup(void)
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set_io_port_base((unsigned long) KSEG1);
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+ if (fw_arg0 == -2) /* UHI interface */
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+ dtb = (void *)fw_arg1;
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+ else if (__dtb_start != __dtb_end)
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+ dtb = (void *)__dtb_start;
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+ else
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+ panic("no dtb found");
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+
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/*
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- * Load the builtin devicetree. This causes the chosen node to be
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+ * Load the devicetree. This causes the chosen node to be
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* parsed resulting in our memory appearing
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*/
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- __dt_setup_arch(__dtb_start);
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+ __dt_setup_arch(dtb);
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}
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void __init device_tree_init(void)
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