[POWERPC] Add device tree utility functions to zImage
This patch adds a library of useful device tree manipulation functions
to the zImage library, for use by platform code. These functions are
based on the hooks already in dt_ops, so they're not dependent on a
particular device tree implementation. This patch also slightly
streamlines the code in main.c using these new functions.
This is a consolidation of my work in this area with Scott Wood's
patches to a very similar end.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c
index e1df8fe..ab9dfe2 100644
--- a/arch/powerpc/boot/main.c
+++ b/arch/powerpc/boot/main.c
@@ -153,13 +153,10 @@
return (struct addr_range){addr, ei.memsize};
}
-static struct addr_range prep_initrd(struct addr_range vmlinux,
+static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
unsigned long initrd_addr,
unsigned long initrd_size)
{
- void *devp;
- u32 initrd_start, initrd_end;
-
/* If we have an image attached to us, it overrides anything
* supplied by the loader. */
if (_initrd_end > _initrd_start) {
@@ -198,16 +195,8 @@
printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
/* Tell the kernel initrd address via device tree */
- devp = finddevice("/chosen");
- if (! devp)
- fatal("Device tree has no chosen node!\n\r");
-
- initrd_start = (u32)initrd_addr;
- initrd_end = (u32)initrd_addr + initrd_size;
-
- setprop(devp, "linux,initrd-start", &initrd_start,
- sizeof(initrd_start));
- setprop(devp, "linux,initrd-end", &initrd_end, sizeof(initrd_end));
+ setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
+ setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
return (struct addr_range){(void *)initrd_addr, initrd_size};
}
@@ -254,6 +243,7 @@
kernel_entry_t kentry;
char cmdline[COMMAND_LINE_SIZE];
unsigned long ft_addr = 0;
+ void *chosen;
if (console_ops.open && (console_ops.open() < 0))
exit();
@@ -263,9 +253,14 @@
printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
_start, get_sp());
+ /* Ensure that the device tree has a /chosen node */
+ chosen = finddevice("/chosen");
+ if (!chosen)
+ chosen = create_node(NULL, "chosen");
+
vmlinux = prep_kernel();
- initrd = prep_initrd(vmlinux, loader_info.initrd_addr,
- loader_info.initrd_size);
+ initrd = prep_initrd(vmlinux, chosen,
+ loader_info.initrd_addr, loader_info.initrd_size);
/* If cmdline came from zimage wrapper or if we can edit the one
* in the dt, print it out and edit it, if possible.