ramips: Introduce CONFIG_MIPS_APPENDED_RAW_DTB to arch/mips/ralink

This commit introduces CONFIG_MIPS_APPENDED_RAW_DTB as an alternative to
OWRTDTB. Both solutions can be used concurrently until all board
configurations have been changed.

Signed-off-by: Tobias Wolf <github-NTEO@vplace.de>
[Jo-Philipp Wich: rewrap commit message]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/target/linux/ramips/patches-4.4/997-ralink-Introduce-fw_passed_dtb-to-arch-mips-ralink.patch b/target/linux/ramips/patches-4.4/997-ralink-Introduce-fw_passed_dtb-to-arch-mips-ralink.patch
new file mode 100644 (file)
index 0000000..fb5fd98
--- /dev/null
+++ b/target/linux/ramips/patches-4.4/997-ralink-Introduce-fw_passed_dtb-to-arch-mips-ralink.patch
@@ -0,0 +1,28 @@
+--- a/arch/mips/ralink/of.c
++++ b/arch/mips/ralink/of.c
+@@ -81,13 +81,23 @@
+ 
+ void __init plat_mem_setup(void)
+ {
++      void *dtb = NULL;
++
+       set_io_port_base(KSEG1);
+ 
+       /*
+        * Load the builtin devicetree. This causes the chosen node to be
+-       * parsed resulting in our memory appearing
++       * parsed resulting in our memory appearing. fw_passed_dtb is used
++       * by CONFIG_MIPS_APPENDED_RAW_DTB as well.
+        */
+-      __dt_setup_arch(&__image_dtb);
++      if (fw_passed_dtb)
++              dtb = (void *)fw_passed_dtb;
++      else if (__dtb_start != __dtb_end)
++              dtb = (void *)__dtb_start;
++      else
++              dtb = &__image_dtb;
++
++      __dt_setup_arch(dtb);
+ 
+       of_scan_flat_dt(early_init_dt_find_chosen, NULL);
+       if (chosen_dtb)