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Diffstat (limited to 'board/raspberrypi/rpi/rpi.c')
-rw-r--r--board/raspberrypi/rpi/rpi.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index 6245b3678f..ffd6d315ed 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -25,6 +25,9 @@
DECLARE_GLOBAL_DATA_PTR;
+/* From lowlevel_init.S */
+extern unsigned long fw_dtb_pointer;
+
static const struct bcm2835_gpio_platdata gpio_platdata = {
.base = BCM2835_GPIO_BASE,
};
@@ -285,6 +288,31 @@ static void set_fdtfile(void)
setenv("fdtfile", fdtfile);
}
+/*
+ * If the firmware provided a valid FDT at boot time, let's expose it in
+ * ${fdt_addr} so it may be passed unmodified to the kernel.
+ */
+static void set_fdt_addr(void)
+{
+ if (getenv("fdt_addr"))
+ return;
+
+ if (fdt_magic(fw_dtb_pointer) != FDT_MAGIC)
+ return;
+
+ setenv_hex("fdt_addr", fw_dtb_pointer);
+}
+
+/*
+ * Prevent relocation from stomping on a firmware provided FDT blob.
+ */
+unsigned long board_get_usable_ram_top(unsigned long total_size)
+{
+ if ((gd->ram_top - fw_dtb_pointer) > SZ_64M)
+ return gd->ram_top;
+ return fw_dtb_pointer & ~0xffff;
+}
+
static void set_usbethaddr(void)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
@@ -356,6 +384,7 @@ static void set_serial_number(void)
int misc_init_r(void)
{
+ set_fdt_addr();
set_fdtfile();
set_usbethaddr();
#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG