v4.19.13 snapshot.
diff --git a/arch/powerpc/boot/treeboot-iss4xx.c b/arch/powerpc/boot/treeboot-iss4xx.c
new file mode 100644
index 0000000..733f8bf
--- /dev/null
+++ b/arch/powerpc/boot/treeboot-iss4xx.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
+ *
+ * Based on earlier code:
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * Matt Porter <mporter@kernel.crashing.org>
+ * Copyright 2002-2005 MontaVista Software Inc.
+ *
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ * Copyright (c) 2003, 2004 Zultys Technologies
+ *
+ * Copyright 2007 David Gibson, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <stdarg.h>
+#include <stddef.h>
+#include "types.h"
+#include "elf.h"
+#include "string.h"
+#include "stdio.h"
+#include "page.h"
+#include "ops.h"
+#include "reg.h"
+#include "io.h"
+#include "dcr.h"
+#include "4xx.h"
+#include "44x.h"
+#include "libfdt.h"
+
+BSS_STACK(4096);
+
+static u32 ibm4xx_memstart;
+
+static void iss_4xx_fixups(void)
+{
+ void *memory;
+ u32 reg[3];
+
+ memory = finddevice("/memory");
+ if (!memory)
+ fatal("Can't find memory node\n");
+ /* This assumes #address-cells = 2, #size-cells =1 and that */
+ getprop(memory, "reg", reg, sizeof(reg));
+ if (reg[2])
+ /* If the device tree specifies the memory range, use it */
+ ibm4xx_memstart = reg[1];
+ else
+ /* othersize, read it from the SDRAM controller */
+ ibm4xx_sdram_fixup_memsize();
+}
+
+static void *iss_4xx_vmlinux_alloc(unsigned long size)
+{
+ return (void *)ibm4xx_memstart;
+}
+
+#define SPRN_PIR 0x11E /* Processor Identification Register */
+void platform_init(void)
+{
+ unsigned long end_of_ram = 0x08000000;
+ unsigned long avail_ram = end_of_ram - (unsigned long)_end;
+ u32 pir_reg;
+
+ simple_alloc_init(_end, avail_ram, 128, 64);
+ platform_ops.fixups = iss_4xx_fixups;
+ platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
+ platform_ops.exit = ibm44x_dbcr_reset;
+ pir_reg = mfspr(SPRN_PIR);
+ fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
+ fdt_init(_dtb_start);
+ serial_console_init();
+}