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authorVineet Gupta <vgupta@synopsys.com>2014-01-16 15:04:24 +0530
committerVineet Gupta <vgupta@synopsys.com>2014-01-16 18:53:16 +0530
commite57d339a6264355df8c98948f05a46ff2bc5d504 (patch)
treeb176d8540cad72142941dcdf96ee60644088db50 /arch/arc
parent59ed9413533897823bcdb4c79fd2904718e25b0a (diff)
downloadlinux-e57d339a6264355df8c98948f05a46ff2bc5d504.tar.bz2
ARC: [cmdline] support External Device Trees from u-boot
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/kernel/setup.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index ffb60b4f6f86..119dddb752b2 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -323,22 +323,31 @@ static inline int is_kernel(unsigned long addr)
void __init setup_arch(char **cmdline_p)
{
+ /* make sure that uboot passed pointer to cmdline/dtb is valid */
+ if (uboot_tag && is_kernel((unsigned long)uboot_arg))
+ panic("Invalid uboot arg\n");
+
+ /* See if u-boot passed an external Device Tree blob */
+ machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
+ if (!machine_desc) {
+ /* No, so try the embedded one */
machine_desc = setup_machine_fdt(__dtb_start);
if (!machine_desc)
panic("Embedded DT invalid\n");
/*
- * Append uboot cmdline to embedded DT cmdline.
+ * If we are here, it is established that @uboot_arg didn't
+ * point to DT blob. Instead if u-boot says it is cmdline,
+ * Appent to embedded DT cmdline.
* setup_machine_fdt() would have populated @boot_command_line
*/
if (uboot_tag == 1) {
- BUG_ON(is_kernel(unsigned long)uboot_arg);
-
/* Ensure a whitespace between the 2 cmdlines */
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
strlcat(boot_command_line, uboot_arg,
COMMAND_LINE_SIZE);
}
+ }
/* Save unparsed command line copy for /proc/cmdline */
*cmdline_p = boot_command_line;