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Allow boards to initialize the DT at runtime.

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In some boards like the Raspberry Pi the initial bootloader will pass
a DT to the kernel. When using U-Boot as such kernel, the board code in
U-Boot should be able to provide U-Boot with this, already assembled
device tree blob.

This patch introduces a new config option CONFIG_OF_BOARD to use instead
of CONFIG_OF_EMBED or CONFIG_OF_SEPARATE which will initialize the DT
from a board-specific funtion instead of bundling one with U-Boot or as
a separated file. This allows boards like the Raspberry Pi to reuse the
device tree passed from the bootcode.bin and start.elf firmware
files, including the run-time selected device tree overlays.

Signed-off-by: Alex Deymo <deymo@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Alex Deymo 2017-04-02 01:25:20 -07:00 • committed by Tom Rini
parent 45a6d231b2
commit 82f766d1d2
6 changed files with 38 additions and 1 deletions
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10
board/raspberrypi/rpi/rpi.c
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@ -470,6 +470,16 @@ int board_init(void)
return bcm2835_power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
}
/*
* If the firmware passed a device tree use it for U-Boot.
*/
void *board_fdt_blob_setup(void)
{
if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
return NULL;
return (void *)fw_dtb_pointer;
}
int ft_board_setup(void *blob, bd_t *bd)
{
/*