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| author | Simon Glass <sjg@chromium.org> | 2011-10-24 19:15:31 +0000 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2011-10-26 21:39:26 +0200 |
| commit | 2c0f79e44bfdc592913b96aeeb7ecc5acca6eb37 (patch) | |
| tree | a18e02762410787513411423f9d6989cfd698d31 | |
| parent | bbb0b128c3956ac549471addc314702fbe0ace63 (diff) | |
| download | u-boot-imx-2c0f79e44bfdc592913b96aeeb7ecc5acca6eb37.zip u-boot-imx-2c0f79e44bfdc592913b96aeeb7ecc5acca6eb37.tar.gz u-boot-imx-2c0f79e44bfdc592913b96aeeb7ecc5acca6eb37.tar.bz2 | |
fdt: Add support for a separate device tree (CONFIG_OF_SEPARATE)
This adds support for an FDT to be build as a separate binary file called
u-boot.dtb. This can be concatenated with the U-Boot binary to provide a
device tree located at run-time by U-Boot. The Makefile is modified to
provide this file in u-boot-dtb.bin.
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Makefile | 8 | ||||
| -rw-r--r-- | README | 16 |
3 files changed, 23 insertions, 2 deletions
@@ -35,6 +35,7 @@ /u-boot.dis /u-boot.lds /u-boot.ubl +/u-boot.dtb # # Generated files @@ -359,9 +359,17 @@ ALL-$(CONFIG_ONENAND_U_BOOT) += $(obj)u-boot-onenand.bin ONENAND_BIN ?= $(obj)onenand_ipl/onenand-ipl-2k.bin ALL-$(CONFIG_MMC_U_BOOT) += $(obj)mmc_spl/u-boot-mmc-spl.bin ALL-$(CONFIG_SPL) += $(obj)spl/u-boot-spl.bin +ALL-$(CONFIG_OF_SEPARATE) += $(obj)u-boot.dtb $(obj)u-boot-dtb.bin all: $(ALL-y) $(SUBDIR_EXAMPLES) +$(obj)u-boot.dtb: $(obj)u-boot + $(MAKE) -C dts binary + mv $(obj)dts/dt.dtb $@ + +$(obj)u-boot-dtb.bin: $(obj)u-boot.bin $(obj)u-boot.dtb + cat $^ >$@ + $(obj)u-boot.hex: $(obj)u-boot $(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@ @@ -824,8 +824,8 @@ The following options need to be configured: experimental and only available on a few boards. The device tree is available in the global data as gd->fdt_blob. - U-Boot needs to get its device tree from somewhere. At present - the only way is to embed it in the image with CONFIG_OF_EMBED. + U-Boot needs to get its device tree from somewhere. This can + be done using one of the two options below: CONFIG_OF_EMBED If this variable is defined, U-Boot will embed a device tree @@ -834,6 +834,18 @@ The following options need to be configured: is then picked up in board_init_f() and made available through the global data structure as gd->blob. + CONFIG_OF_SEPARATE + If this variable is defined, U-Boot will build a device tree + binary. It will be called u-boot.dtb. Architecture-specific + code will locate it at run-time. Generally this works by: + + cat u-boot.bin u-boot.dtb >image.bin + + and in fact, U-Boot does this for you, creating a file called + u-boot-dtb.bin which is useful in the common case. You can + still use the individual files if you need something more + exotic. + - Watchdog: CONFIG_WATCHDOG If this variable is defined, it enables watchdog |