From: Paul Cercueil <paul@crapouillou.net>
To: Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH] MIPS: ingenic: Add support for appended devicetree
Date: Thu, 21 Feb 2019 17:38:20 -0300 [thread overview]
Message-ID: <20190221203820.7044-1-paul@crapouillou.net> (raw)
Add support for booting the kernel from an externally-appended
devicetree, if no devicetree was built-in.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
arch/mips/Kconfig | 2 +-
arch/mips/jz4740/setup.c | 14 +++++++++++---
2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index a84c24d894aa..8b7ea9062198 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -391,7 +391,7 @@ config MACH_INGENIC
select GPIOLIB
select COMMON_CLK
select GENERIC_IRQ_CHIP
- select BUILTIN_DTB
+ select BUILTIN_DTB if MIPS_NO_APPENDED_DTB
select USE_OF
select LIBFDT
diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
index afb40f8bce96..5c00064937c4 100644
--- a/arch/mips/jz4740/setup.c
+++ b/arch/mips/jz4740/setup.c
@@ -31,6 +31,7 @@
#define JZ4740_EMC_SDRAM_CTRL 0x80
+extern const char __appended_dtb;
static void __init jz4740_detect_mem(void)
{
@@ -66,15 +67,22 @@ static unsigned long __init get_board_mach_type(const void *fdt)
void __init plat_mem_setup(void)
{
int offset;
+ void *dtb;
jz4740_reset_init();
- __dt_setup_arch(__dtb_start);
- offset = fdt_path_offset(__dtb_start, "/memory");
+ if (__dtb_start != __dtb_end)
+ dtb = __dtb_start;
+ else
+ dtb = (void *)&__appended_dtb;
+
+ __dt_setup_arch(dtb);
+
+ offset = fdt_path_offset(dtb, "/memory");
if (offset < 0)
jz4740_detect_mem();
- mips_machtype = get_board_mach_type(__dtb_start);
+ mips_machtype = get_board_mach_type(dtb);
}
void __init device_tree_init(void)
--
2.11.0
next reply other threads:[~2019-02-21 20:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-21 20:38 Paul Cercueil [this message]
2019-02-21 21:13 ` [PATCH] MIPS: ingenic: Add support for appended devicetree Jonas Gorski
2019-02-21 21:50 ` Paul Cercueil
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