diff options
| author | David Gibson <david@gibson.dropbear.id.au> | 2007-03-22 07:02:21 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-04-12 19:55:14 +0200 |
| commit | 27fbaa9702e548e74dffd21855769f6cedad42bd (patch) | |
| tree | 2af4decec01306e34031e2a62a3932991b899fbc /arch/powerpc/boot/main.c | |
| parent | [POWERPC] Use mtocrf instruction in asm when CONFIG_POWER4_ONLY=y (diff) | |
| download | linux-27fbaa9702e548e74dffd21855769f6cedad42bd.tar.xz linux-27fbaa9702e548e74dffd21855769f6cedad42bd.zip | |
[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>
Diffstat (limited to 'arch/powerpc/boot/main.c')
| -rw-r--r-- | arch/powerpc/boot/main.c | 27 |
1 files changed, 11 insertions, 16 deletions
diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c index e1df8feaf16d..ab9dfe2b38f1 100644 --- a/arch/powerpc/boot/main.c +++ b/arch/powerpc/boot/main.c @@ -153,13 +153,10 @@ static struct addr_range prep_kernel(void) 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 @@ static struct addr_range prep_initrd(struct addr_range vmlinux, 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 @@ void start(void) 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 @@ void start(void) 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. |