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-rw-r--r--arch/powerpc/boot/main.c57
1 files changed, 28 insertions, 29 deletions
diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c
index d719bb9333d1..6f6b50d238b6 100644
--- a/arch/powerpc/boot/main.c
+++ b/arch/powerpc/boot/main.c
@@ -27,6 +27,8 @@ extern char _vmlinux_start[];
extern char _vmlinux_end[];
extern char _initrd_start[];
extern char _initrd_end[];
+extern char _dtb_start[];
+extern char _dtb_end[];
struct addr_range {
unsigned long addr;
@@ -167,7 +169,7 @@ static int is_elf32(void *hdr)
return 1;
}
-static void prep_kernel(unsigned long *a1, unsigned long *a2)
+static void prep_kernel(unsigned long a1, unsigned long a2)
{
int len;
@@ -203,11 +205,14 @@ static void prep_kernel(unsigned long *a1, unsigned long *a2)
}
/*
- * Now we try to alloc memory for the initrd (and copy it there)
+ * Now find the initrd
+ *
+ * First see if we have an image attached to us. If so
+ * allocate memory for it and copy it there.
*/
initrd.size = (unsigned long)(_initrd_end - _initrd_start);
initrd.memsize = initrd.size;
- if ( initrd.size > 0 ) {
+ if (initrd.size > 0) {
printf("Allocating 0x%lx bytes for initrd ...\n\r",
initrd.size);
initrd.addr = (unsigned long)malloc((u32)initrd.size);
@@ -216,8 +221,6 @@ static void prep_kernel(unsigned long *a1, unsigned long *a2)
"ramdisk !\n\r");
exit();
}
- *a1 = initrd.addr;
- *a2 = initrd.size;
printf("initial ramdisk moving 0x%lx <- 0x%lx "
"(0x%lx bytes)\n\r", initrd.addr,
(unsigned long)_initrd_start, initrd.size);
@@ -225,6 +228,12 @@ static void prep_kernel(unsigned long *a1, unsigned long *a2)
initrd.size);
printf("initrd head: 0x%lx\n\r",
*((unsigned long *)initrd.addr));
+ } else if (a2 != 0) {
+ /* Otherwise, see if yaboot or another loader gave us an initrd */
+ initrd.addr = a1;
+ initrd.memsize = initrd.size = a2;
+ printf("Using loader supplied initrd at 0x%lx (0x%lx bytes)\n\r",
+ initrd.addr, initrd.size);
}
/* Eventually gunzip the kernel */
@@ -250,10 +259,6 @@ static void prep_kernel(unsigned long *a1, unsigned long *a2)
flush_cache((void *)vmlinux.addr, vmlinux.size);
}
-void __attribute__ ((weak)) ft_init(void *dt_blob)
-{
-}
-
/* A buffer that may be edited by tools operating on a zImage binary so as to
* edit the command line passed to vmlinux (by setting /chosen/bootargs).
* The buffer is put in it's own section so that tools may locate it easier.
@@ -285,36 +290,22 @@ static void set_cmdline(char *buf)
setprop(devp, "bootargs", buf, strlen(buf) + 1);
}
-/* Section where ft can be tacked on after zImage is built */
-union blobspace {
- struct boot_param_header hdr;
- char space[8*1024];
-} dt_blob __attribute__((__section__("__builtin_ft")));
-
struct platform_ops platform_ops;
struct dt_ops dt_ops;
struct console_ops console_ops;
void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
{
- int have_dt = 0;
kernel_entry_t kentry;
char cmdline[COMMAND_LINE_SIZE];
+ unsigned long ft_addr = 0;
memset(__bss_start, 0, _end - __bss_start);
memset(&platform_ops, 0, sizeof(platform_ops));
memset(&dt_ops, 0, sizeof(dt_ops));
memset(&console_ops, 0, sizeof(console_ops));
- /* Override the dt_ops and device tree if there was an flat dev
- * tree attached to the zImage.
- */
- if (dt_blob.hdr.magic == OF_DT_HEADER) {
- have_dt = 1;
- ft_init(&dt_blob);
- }
-
- if (platform_init(promptr))
+ if (platform_init(promptr, _dtb_start, _dtb_end))
exit();
if (console_ops.open && (console_ops.open() < 0))
exit();
@@ -324,7 +315,7 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
_start, sp);
- prep_kernel(&a1, &a2);
+ prep_kernel(a1, a2);
/* If cmdline came from zimage wrapper or if we can edit the one
* in the dt, print it out and edit it, if possible.
@@ -338,15 +329,23 @@ void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
set_cmdline(cmdline);
}
+ printf("Finalizing device tree...");
+ if (dt_ops.finalize)
+ ft_addr = dt_ops.finalize();
+ if (ft_addr)
+ printf(" flat tree at 0x%lx\n\r", ft_addr);
+ else
+ printf(" using OF tree (promptr=%p)\n\r", promptr);
+
if (console_ops.close)
console_ops.close();
kentry = (kernel_entry_t) vmlinux.addr;
- if (have_dt)
- kentry(dt_ops.ft_addr(), 0, NULL);
+ if (ft_addr)
+ kentry(ft_addr, 0, NULL);
else
/* XXX initrd addr/size should be passed in properties */
- kentry(a1, a2, promptr);
+ kentry(initrd.addr, initrd.size, promptr);
/* console closed so printf below may not work */
printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");