v4.19.13 snapshot.
diff --git a/arch/powerpc/boot/treeboot-walnut.c b/arch/powerpc/boot/treeboot-walnut.c
new file mode 100644
index 0000000..097974e
--- /dev/null
+++ b/arch/powerpc/boot/treeboot-walnut.c
@@ -0,0 +1,84 @@
+/*
+ * Old U-boot compatibility for Walnut
+ *
+ * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
+ *
+ * Copyright 2007 IBM Corporation
+ * Based on cuboot-83xx.c, which is:
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * 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 "stdio.h"
+#include "dcr.h"
+#include "4xx.h"
+#include "io.h"
+
+BSS_STACK(4096);
+
+static void walnut_flashsel_fixup(void)
+{
+ void *devp, *sram;
+ u32 reg_flash[3] = {0x0, 0x0, 0x80000};
+ u32 reg_sram[3] = {0x0, 0x0, 0x80000};
+ u8 *fpga;
+ u8 fpga_brds1 = 0x0;
+
+ devp = finddevice("/plb/ebc/fpga");
+ if (!devp)
+ fatal("Couldn't locate FPGA node\n\r");
+
+ if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
+ fatal("no virtual-reg property\n\r");
+
+ fpga_brds1 = in_8(fpga);
+
+ devp = finddevice("/plb/ebc/flash");
+ if (!devp)
+ fatal("Couldn't locate flash node\n\r");
+
+ if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
+ fatal("flash reg property has unexpected size\n\r");
+
+ sram = finddevice("/plb/ebc/sram");
+ if (!sram)
+ fatal("Couldn't locate sram node\n\r");
+
+ if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
+ fatal("sram reg property has unexpected size\n\r");
+
+ if (fpga_brds1 & 0x1) {
+ reg_flash[1] ^= 0x80000;
+ reg_sram[1] ^= 0x80000;
+ }
+
+ setprop(devp, "reg", reg_flash, sizeof(reg_flash));
+ setprop(sram, "reg", reg_sram, sizeof(reg_sram));
+}
+
+#define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
+static void walnut_fixups(void)
+{
+ ibm4xx_sdram_fixup_memsize();
+ ibm405gp_fixup_clocks(33330000, 0xa8c000);
+ ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
+ ibm4xx_fixup_ebc_ranges("/plb/ebc");
+ walnut_flashsel_fixup();
+ dt_fixup_mac_address_by_alias("ethernet0", (u8 *) WALNUT_OPENBIOS_MAC_OFF);
+}
+
+void platform_init(void)
+{
+ unsigned long end_of_ram = 0x2000000;
+ unsigned long avail_ram = end_of_ram - (unsigned long) _end;
+
+ simple_alloc_init(_end, avail_ram, 32, 32);
+ platform_ops.fixups = walnut_fixups;
+ platform_ops.exit = ibm40x_dbcr_reset;
+ fdt_init(_dtb_start);
+ serial_console_init();
+}