[POWERPC] bootwrapper: Add a firmware-independent simpleboot target.
This target produces a flat binary rather than an ELF file,
fixes the entry point at the beginning of the image, and takes
a complete device tree with no fixups needed.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
diff --git a/arch/powerpc/boot/simpleboot.c b/arch/powerpc/boot/simpleboot.c
new file mode 100644
index 0000000..86cd285
--- /dev/null
+++ b/arch/powerpc/boot/simpleboot.c
@@ -0,0 +1,84 @@
+/*
+ * The simple platform -- for booting when firmware doesn't supply a device
+ * tree or any platform configuration information.
+ * All data is extracted from an embedded device tree
+ * blob.
+ *
+ * Authors: Scott Wood <scottwood@freescale.com>
+ * Grant Likely <grant.likely@secretlab.ca>
+ *
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ * Copyright (c) 2008 Secret Lab Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include "ops.h"
+#include "types.h"
+#include "io.h"
+#include "stdio.h"
+#include "libfdt/libfdt.h"
+
+BSS_STACK(4*1024);
+
+void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+ unsigned long r6, unsigned long r7)
+{
+ const u32 *na, *ns, *reg, *timebase;
+ u64 memsize64;
+ int node, size, i;
+
+ /* Make sure FDT blob is sane */
+ if (fdt_check_header(_dtb_start) != 0)
+ fatal("Invalid device tree blob\n");
+
+ /* Find the #address-cells and #size-cells properties */
+ node = fdt_path_offset(_dtb_start, "/");
+ if (node < 0)
+ fatal("Cannot find root node\n");
+ na = fdt_getprop(_dtb_start, node, "#address-cells", &size);
+ if (!na || (size != 4))
+ fatal("Cannot find #address-cells property");
+ ns = fdt_getprop(_dtb_start, node, "#size-cells", &size);
+ if (!ns || (size != 4))
+ fatal("Cannot find #size-cells property");
+
+ /* Find the memory range */
+ node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
+ "memory", sizeof("memory"));
+ if (node < 0)
+ fatal("Cannot find memory node\n");
+ reg = fdt_getprop(_dtb_start, node, "reg", &size);
+ if (size < (*na+*ns) * sizeof(u32))
+ fatal("cannot get memory range\n");
+
+ /* Only interested in memory based at 0 */
+ for (i = 0; i < *na; i++)
+ if (*reg++ != 0)
+ fatal("Memory range is not based at address 0\n");
+
+ /* get the memsize and trucate it to under 4G on 32 bit machines */
+ memsize64 = 0;
+ for (i = 0; i < *ns; i++)
+ memsize64 = (memsize64 << 32) | *reg++;
+ if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
+ memsize64 = 0xffffffff;
+
+ /* finally, setup the timebase */
+ node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
+ "cpu", sizeof("cpu"));
+ if (!node)
+ fatal("Cannot find cpu node\n");
+ timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
+ if (timebase && (size == 4))
+ timebase_period_ns = 1000000000 / *timebase;
+
+ /* Now we have the memory size; initialize the heap */
+ simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64);
+
+ /* prepare the device tree and find the console */
+ fdt_init(_dtb_start);
+ serial_console_init();
+}