nios2: add fdt support
This patch adds fdt support to boot linux, followed Michal's
work on microblaze.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
diff --git a/arch/nios2/lib/bootm.c b/arch/nios2/lib/bootm.c
index e4093a8..e25a113 100644
--- a/arch/nios2/lib/bootm.c
+++ b/arch/nios2/lib/bootm.c
@@ -34,6 +34,18 @@
char *commandline = getenv("bootargs");
ulong initrd_start = images->rd_start;
ulong initrd_end = images->rd_end;
+ char *of_flat_tree = NULL;
+#if defined(CONFIG_OF_LIBFDT)
+ ulong of_size = 0;
+
+ /* find flattened device tree */
+ if (boot_get_fdt(flag, argc, argv, images, &of_flat_tree, &of_size))
+ return 1;
+#endif
+ if (!of_flat_tree)
+ of_flat_tree = (char *)simple_strtoul(argv[3], NULL, 16);
+ if (of_flat_tree)
+ initrd_end = (ulong)of_flat_tree;
if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
return 1;
@@ -45,6 +57,15 @@
debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
+ /* kernel parameters passing
+ * r4 : NIOS magic
+ * r5 : initrd start
+ * r6 : initrd end or fdt
+ * r7 : kernel command line
+ * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
+ * verified with fdt magic. when both initrd and fdt are used at the
+ * same time, fdt must follow immediately after initrd.
+ */
kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
/* does not return */