diff options
Diffstat (limited to 'board/raspberrypi/rpi/rpi.c')
| -rw-r--r-- | board/raspberrypi/rpi/rpi.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c index 6245b3678f1..ffd6d315ed9 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 |