576621f1e3
This patch introduces support of new boards with ARC cores.
[1] Synopsys SDP board
This is a new-generation development board from Synopsys that
consists of base-board and CPU tile-board (which might have a real
ASIC or FPGA with CPU image).
It sports a lot of DesignWare peripherals like GMAC, USB, SPI, I2C
etc and is intended to be used for early development of ARC-based
products.
[2] nSIM
This is a virtual board implemented in Synopsys proprietary
software simulator (even though available for free for open source
community). This board has only serial port as a peripheral and so
it is meant to be used for runtime testing which is especially
useful during bring-up of new tools and platforms.
What's also important ARC cores are very configurable so there're
many variations of options like cache sizes, their line lengths,
additional hardware blocks like multipliers, dividers etc. And this
board could be used to make sure built software still runs on
different HW configurations.
Cc: Felix Fietkau <nbd@openwrt.org>
Cc: Jo-Philipp Wich <jow@openwrt.org>
Cc: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
SVN-Revision: 47589
91 lines
2.7 KiB
Diff
91 lines
2.7 KiB
Diff
From 142abc9f7b8860638e39cf3850cf7ba328c26b42 Mon Sep 17 00:00:00 2001
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From: Alexey Brodkin <abrodkin@synopsys.com>
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Date: Sat, 31 Oct 2015 15:58:20 +0300
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Subject: [PATCH] openwrt: arc - add OWRTDTB section
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This change allows OpenWRT to patch resulting kernel binary with
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external .dtb.
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That allows us to re-use exactky the same vmlinux on different boards
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given its ARC core configurations match (at least cache line sizes etc).
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""patch-dtb" searches for ASCII "OWRTDTB:" strign and copies external
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.dtb right after it, keeping the string in place.
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Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
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---
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arch/arc/kernel/head.S | 10 ++++++++++
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arch/arc/kernel/setup.c | 4 +++-
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arch/arc/kernel/vmlinux.lds.S | 13 +++++++++++++
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3 files changed, 26 insertions(+), 1 deletion(-)
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diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
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index 689dd86..51154ae 100644
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--- a/arch/arc/kernel/head.S
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+++ b/arch/arc/kernel/head.S
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@@ -49,6 +49,16 @@
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1:
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.endm
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+; Here "patch-dtb" will embed external .dtb
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+; Note "patch-dtb" searches for ASCII "OWRTDTB:" string
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+; and pastes .dtb right after it, hense the string precedes
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+; __image_dtb symbol.
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+ .section .owrt, "aw",@progbits
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+ .ascii "OWRTDTB:"
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+ENTRY(__image_dtb)
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+ .fill 0x4000
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+END(__image_dtb)
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+
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.section .init.text, "ax",@progbits
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;----------------------------------------------------------------
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diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
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index c33e77c..96fbfd0 100644
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--- a/arch/arc/kernel/setup.c
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+++ b/arch/arc/kernel/setup.c
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@@ -370,6 +370,8 @@ static inline int is_kernel(unsigned long addr)
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return 0;
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}
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+extern struct boot_param_header __image_dtb;
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+
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void __init setup_arch(char **cmdline_p)
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{
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#ifdef CONFIG_ARC_UBOOT_SUPPORT
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@@ -383,7 +385,7 @@ void __init setup_arch(char **cmdline_p)
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#endif
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{
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/* No, so try the embedded one */
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- machine_desc = setup_machine_fdt(__dtb_start);
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+ machine_desc = setup_machine_fdt(&__image_dtb);
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if (!machine_desc)
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panic("Embedded DT invalid\n");
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diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
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index dd35bde..f309104 100644
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--- a/arch/arc/kernel/vmlinux.lds.S
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+++ b/arch/arc/kernel/vmlinux.lds.S
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@@ -30,6 +30,19 @@ SECTIONS
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. = CONFIG_LINUX_LINK_BASE;
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+ /*
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+ * In OpenWRT we want to patch built binary embedding .dtb of choice.
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+ * This is implemented with "patch-dtb" utility which searches for
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+ * "OWRTDTB:" string in first 16k of image and if it is found
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+ * copies .dtb right after mentioned string.
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+ *
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+ * Note: "OWRTDTB:" won't be overwritten with .dtb, .dtb will follow it.
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+ */
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+ .owrt : {
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+ *(.owrt)
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+ . = ALIGN(PAGE_SIZE);
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+ }
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+
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_int_vec_base_lds = .;
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.vector : {
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*(.vector)
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--
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2.4.3
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