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Makefile: Add environment variable DEVICE_TREE to header

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Users have option to overwrite default device tree
(CONFIG_DEFAULT_DEVICE_TREE) via environment variable DEVICE_TREE.

Feature has been added long time ago by commit 74de8c9a16
("dts/Makefile: Build the user specified dts") for a little bit different
reason.

But this variable can be also used for different purpose like choosing
proper configuration from FIT image in SPL.
And this is the functionality I would like to use on Xilinx Zynq devices
that current u-boot.img can be composed in the same way based on OF_LIST
and different configuration is taken based on platform specific SPL.
SPL requires low level ps7_init_gpl configuration that's why different
boards require different SPL with fixed board_fit_config_name_match().

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Michal Simek 2020-02-18 15:03:13 +01:00
parent f5a122e2ab
commit dacec83ce0
2 changed files with 19 additions and 3 deletions
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14
Makefile
View file

@ -483,6 +483,7 @@ endif
version_h := include/generated/version_autogenerated.h
timestamp_h := include/generated/timestamp_autogenerated.h
defaultenv_h := include/generated/defaultenv_autogenerated.h
dt_h := include/generated/dt.h
no-dot-config-targets := clean clobber mrproper distclean \
help %docs check% coccicheck \
@ -1767,7 +1768,7 @@ endif
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile cfg
prepare1: prepare2 $(version_h) $(timestamp_h) \
prepare1: prepare2 $(version_h) $(timestamp_h) $(dt_h) \
include/config/auto.conf
ifeq ($(wildcard $(LDSCRIPT)),)
@echo >&2 " Could not find linker script."
@ -1833,12 +1834,23 @@ define filechk_defaultenv.h
xxd -i ; echo ", 0x00" ; )
endef
define filechk_dt.h
(if test -n "$${DEVICE_TREE}"; then \
echo \#define DEVICE_TREE \"$(DEVICE_TREE)\"; \
else \
echo \#define DEVICE_TREE CONFIG_DEFAULT_DEVICE_TREE; \
fi)
endef
$(version_h): include/config/uboot.release FORCE
$(call filechk,version.h)
$(timestamp_h): $(srctree)/Makefile FORCE
$(call filechk,timestamp.h)
$(dt_h): $(srctree)/Makefile FORCE
$(call filechk,dt.h)
$(defaultenv_h): $(CONFIG_DEFAULT_ENV_FILE:"%"=%) FORCE
$(call filechk,defaultenv.h)

8
arch/arm/mach-zynq/spl.c
View file

@ -6,6 +6,7 @@
#include <debug_uart.h>
#include <hang.h>
#include <spl.h>
#include <generated/dt.h>
#include <asm/io.h>
#include <asm/spl.h>
@ -89,8 +90,11 @@ void spl_board_prepare_for_boot(void)
int board_fit_config_name_match(const char *name)
{
/* Just empty function now - can't decide what to choose */
debug("%s: %s\n", __func__, name);
debug("%s: Check %s, default %s\n", __func__, name, DEVICE_TREE);
return 0;
if (!strcmp(name, DEVICE_TREE))
return 0;
return -1;
}
#endif