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authorArun Bhanu <arun@bhanu.net>2010-04-15 18:27:17 +0800
committerMichal Simek <monstr@monstr.eu>2010-04-16 12:15:13 +0200
commit398b1d57a6a56aada1f77198746a7dd1b038cd5d (patch)
tree8a1648b4db1e77083ef6daf6114d6e465bd1aabe
parent2a72e9ed18d2164eb7fe569119342eb631b568da (diff)
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microblaze: Add FDT support
This patch adds FDT (flattened device tree) support to microblaze arch. Tested with Linux arch/microblaze kernels with and without compiled in FDT on Xilinx ML506 board. Signed-off-by: Arun Bhanu <arun@bhanu.net> Signed-off-by: Michal Simek <monstr@monstr.eu>
-rw-r--r--arch/microblaze/lib/bootm.c39
1 files changed, 34 insertions, 5 deletions
diff --git a/arch/microblaze/lib/bootm.c b/arch/microblaze/lib/bootm.c
index bce4774..fef563b 100644
--- a/arch/microblaze/lib/bootm.c
+++ b/arch/microblaze/lib/bootm.c
@@ -35,22 +35,51 @@ DECLARE_GLOBAL_DATA_PTR;
int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
{
/* First parameter is mapped to $r5 for kernel boot args */
- void (*theKernel) (char *);
+ void (*theKernel) (char *, ulong, ulong);
char *commandline = getenv ("bootargs");
+ ulong rd_data_start, rd_data_end;
if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
return 1;
- theKernel = (void (*)(char *))images->ep;
+ int ret;
+
+ char *of_flat_tree = NULL;
+#if defined(CONFIG_OF_LIBFDT)
+ ulong of_size = 0;
+
+ /* find flattened device tree */
+ ret = boot_get_fdt (flag, argc, argv, images, &of_flat_tree, &of_size);
+ if (ret)
+ return 1;
+#endif
+
+ theKernel = (void (*)(char *, ulong, ulong))images->ep;
+
+ /* find ramdisk */
+ ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_MICROBLAZE,
+ &rd_data_start, &rd_data_end);
+ if (ret)
+ return 1;
show_boot_progress (15);
+ if (!(ulong) of_flat_tree)
+ of_flat_tree = (char *)simple_strtoul (argv[3], NULL, 16);
+
#ifdef DEBUG
- printf ("## Transferring control to Linux (at address %08lx) ...\n",
- (ulong) theKernel);
+ printf ("## Transferring control to Linux (at address 0x%08lx) " \
+ "ramdisk 0x%08lx, FDT 0x%08lx...\n",
+ (ulong) theKernel, rd_data_start, (ulong) of_flat_tree);
#endif
- theKernel (commandline);
+ /*
+ * Linux Kernel Parameters (passing device tree):
+ * r5: pointer to command line
+ * r6: pointer to ramdisk
+ * r7: pointer to the fdt, followed by the board info data
+ */
+ theKernel (commandline, rd_data_start, (ulong) of_flat_tree);
/* does not return */
return 1;