This locates the device tree either embedded within U-Boot or attached to the
end as a separate binary.
When CONFIG_OF_CONTROL is defined, U-Boot requires a valid fdt. A check is
provided for this early in initialisation.
Signed-off-by: Simon Glass <s...@chromium.org>
---
arch/arm/lib/board.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 1fe3751..b0f3162 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -48,6 +48,7 @@
#include <nand.h>
#include <onenand_uboot.h>
#include <mmc.h>
+#include <libfdt.h>
#include <post.h>
#include <logbuff.h>
@@ -197,6 +198,17 @@ static int arm_pci_init(void)
}
#endif /* CONFIG_CMD_PCI || CONFIG_PCI */
+#ifdef CONFIG_OF_CONTROL
+static int check_fdt(void)
+{
+ /* We must have an fdt */
+ if (fdt_check_header(gd->fdt_blob))
+ panic("No valid fdt found - please append one to U-Boot\n"
+ "binary or define CONFIG_OF_EMBED\n");
+ return 0;
+}
+#endif
+
/*
* Breathe some life into the board...
*
@@ -239,6 +251,9 @@ init_fnc_t *init_sequence[] = {
#if defined(CONFIG_BOARD_EARLY_INIT_F)
board_early_init_f,
#endif
+#ifdef CONFIG_OF_CONTROL
+ check_fdt,
+#endif
timer_init, /* initialize timer */
#ifdef CONFIG_FSL_ESDHC
get_clocks,
@@ -276,6 +291,13 @@ void board_init_f(ulong bootflag)
memset((void *)gd, 0, sizeof(gd_t));
gd->mon_len = _bss_end_ofs;
+#ifdef CONFIG_OF_EMBED
+ /* Get a pointer to the FDT */
+ gd->fdt_blob = _binary_dt_dtb_start;
+#elif defined CONFIG_OF_SEPARATE
+ /* FDT is at end of image */
+ gd->fdt_blob = (void *)(_end_ofs + _TEXT_BASE);
+#endif
for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
if ((*init_fnc_ptr)() != 0) {
--
1.7.3.1
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