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Commit 190fe191 authored by Rich Felker's avatar Rich Felker
Browse files

sh: add support for linking a builtin device tree blob in the kernel 



Signed-off-by: default avatarRich Felker <dalias@libc.org>
parent ff18143c

arch/sh/Kconfig

+20 −0
Original line number Diff line number Diff line
@@ -739,6 +739,26 @@ endmenu 


menu "Boot options"



config USE_BUILTIN_DTB

	bool "Use builtin DTB"

	default n

	depends on SH_DEVICE_TREE

	help

	  Link a device tree blob for particular hardware into the kernel,

	  suppressing use of the DTB pointer provided by the bootloader.

	  This option should only be used with legacy bootloaders that are

	  not capable of providing a DTB to the kernel, or for experimental

	  hardware without stable device tree bindings.



config BUILTIN_DTB_SOURCE

	string "Source file for builtin DTB"

	default ""

	depends on USE_BUILTIN_DTB

	help

	  Base name (without suffix, relative to arch/sh/boot/dts) for the

	  a DTS file that will be used to produce the DTB linked into the

	  kernel.



config ZERO_PAGE_OFFSET

	hex

	default "0x00010000" if PAGE_SIZE_64KB || SH_RTS7751R2D || \

arch/sh/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -130,6 +130,8 @@ head-y := arch/sh/kernel/head_$(BITS).o 
core-y				+= arch/sh/kernel/ arch/sh/mm/ arch/sh/boards/

core-$(CONFIG_SH_FPU_EMU)	+= arch/sh/math-emu/



core-$(CONFIG_USE_BUILTIN_DTB)	+= arch/sh/boot/dts/



# Mach groups

machdir-$(CONFIG_SOLUTION_ENGINE)		+= mach-se

machdir-$(CONFIG_SH_HP6XX)			+= mach-hp6xx

arch/sh/boards/of-generic.c

+12 −3
Original line number Diff line number Diff line
@@ -124,13 +124,22 @@ static void __init sh_of_time_init(void) 


static void __init sh_of_setup(char **cmdline_p)

{

	struct device_node *root;



#ifdef CONFIG_USE_BUILTIN_DTB

	unflatten_and_copy_device_tree();

#else

	unflatten_device_tree();

#endif



	board_time_init = sh_of_time_init;



	sh_mv.mv_name = of_flat_dt_get_machine_name();

	if (!sh_mv.mv_name)

	sh_mv.mv_name = "Unknown SH model";

	root = of_find_node_by_path("/");

	if (root) {

		of_property_read_string(root, "model", &sh_mv.mv_name);

		of_node_put(root);

	}



	sh_of_smp_probe();

}

arch/sh/boot/dts/Makefile

0 → 100644
+3 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_USE_BUILTIN_DTB) += $(patsubst "%",%,$(CONFIG_BUILTIN_DTB_SOURCE)).dtb.o



clean-files := *.dtb.S

arch/sh/kernel/setup.c

+4 −0
Original line number Diff line number Diff line
@@ -251,7 +251,11 @@ void __ref sh_fdt_init(phys_addr_t dt_phys) 
	/* Avoid calling an __init function on secondary cpus. */

	if (done) return;



#ifdef CONFIG_USE_BUILTIN_DTB

	dt_virt = __dtb_start;

#else

	dt_virt = phys_to_virt(dt_phys);

#endif



	if (!dt_virt || !early_init_dt_scan(dt_virt)) {

		pr_crit("Error: invalid device tree blob"