Initial support of loader(8) for ARM machines running U-Boot.

This uses the common U-Boot support lib (sys/boot/uboot, already used on
FreeBSD/powerpc), and assumes the underlying firmware has the modern API for
stand-alone apps enabled in the config (CONFIG_API).

Only netbooting is supported at the moment.

Obtained from:	Marvell, Semihalf

sys/arm/arm/locore.S

@@ -66,6 +66,13 @@ __FBSDID("$FreeBSD$");
 ENTRY_NP(btext)
 
 ASENTRY_NP(_start)
+
+/*
+ * Move metadata ptr to r12 (ip)
+ */
+
+	mov	ip, r0
+
 #if defined (FLASHADDR) && defined(LOADERRAMADDR)
 	/* Check if we're running from flash. */
 	ldr	r7, =FLASHADDR
@@ -170,6 +177,8 @@ mmu_done:
 	ldr	pc, .Lvirt_done
 
 virt_done:
+	mov	r0, ip			/* Load argument: metadata ptr */
+
 	mov	fp, #0			/* trace back starts here */
 	bl	_C_LABEL(initarm)	/* Off we go */
 

sys/arm/include/bootinfo.h

@@ -0,0 +1,72 @@
+/*-
+ * Copyright (C) 2006-2008 Semihalf, Marian Balakowicz <m8@semihalf.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_BOOTINFO_H_
+#define _MACHINE_BOOTINFO_H_
+
+#if !defined(LOCORE)
+
+/* Platform hardware spec, received from loader(8) */
+
+#define BI_VERSION	1
+
+struct bi_mem_region {
+	vm_paddr_t	mem_base;
+	vm_size_t	mem_size;
+};
+
+struct bi_eth_addr {
+	u_int8_t	mac_addr[6];
+	u_int8_t	padding[2];
+};
+
+struct bootinfo {
+	u_int32_t	bi_version;
+	vm_offset_t	bi_bar_base;
+	u_int32_t	bi_cpu_clk;
+	u_int32_t	bi_bus_clk;
+	u_int8_t	bi_mem_reg_no;
+	u_int8_t	bi_eth_addr_no;
+	u_int8_t	padding[2];
+
+	u_int8_t	bi_data[1];
+	/*
+	 * The bi_data container is allocated in run time and has the
+	 * following layout:
+	 *
+	 * - bi_mem_reg_no elements of struct bi_mem_region
+	 * - bi_eth_addr_no elements of struct bi_eth_addr
+	 */
+};
+
+extern struct bootinfo *bootinfo;
+
+struct bi_mem_region *bootinfo_mr(void);
+struct bi_eth_addr *bootinfo_eth(void);
+#endif
+
+#endif /* _MACHINE_BOOTINFO_H_ */

sys/arm/include/metadata.h

@@ -29,6 +29,6 @@
 #ifndef _MACHINE_METADATA_H_
 #define	_MACHINE_METADATA_H_
 
-#define	MODINFOMD_SMAP		0x1001
+#define	MODINFOMD_BOOTINFO	0x1001
 
 #endif /* !_MACHINE_METADATA_H_ */

sys/boot/Makefile

@@ -22,7 +22,7 @@ SUBDIR+=		ofw
 .endif
 
 # Build U-Boot library.
-.if ${MACHINE_ARCH} == "powerpc"
+.if ${MACHINE_ARCH} == "powerpc" || ${MACHINE_ARCH} == "arm"
 SUBDIR+=		uboot
 .endif
 

sys/boot/arm/Makefile

@@ -1,5 +1,5 @@
 # $FreeBSD$
 
-SUBDIR=
+SUBDIR=		uboot
 
 .include <bsd.subdir.mk>

sys/boot/arm/uboot/Makefile

@@ -0,0 +1,96 @@
+# $FreeBSD$
+
+PROG=		ubldr
+NEWVERSWHAT=	"U-Boot loader" ${MACHINE_ARCH}
+BINDIR?=	/boot
+INSTALLFLAGS=	-b
+NO_MAN=
+WARNS?=		1
+
+# Architecture-specific loader code
+SRCS=		start.S conf.c vers.c
+
+LOADER_DISK_SUPPORT?=	no
+LOADER_UFS_SUPPORT?=	no
+LOADER_CD9660_SUPPORT?=	no
+LOADER_EXT2FS_SUPPORT?=	no
+LOADER_NET_SUPPORT?=	yes
+LOADER_NFS_SUPPORT?=	yes
+LOADER_TFTP_SUPPORT?=	no
+LOADER_GZIP_SUPPORT?=	no
+LOADER_BZIP2_SUPPORT?=	no
+
+.if ${LOADER_DISK_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_DISK_SUPPORT
+.endif
+.if ${LOADER_UFS_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_UFS_SUPPORT
+.endif
+.if ${LOADER_CD9660_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_CD9660_SUPPORT
+.endif
+.if ${LOADER_EXT2FS_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_EXT2FS_SUPPORT
+.endif
+.if ${LOADER_GZIP_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_GZIP_SUPPORT
+.endif
+.if ${LOADER_BZIP2_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_BZIP2_SUPPORT
+.endif
+.if ${LOADER_NET_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_NET_SUPPORT
+.endif
+.if ${LOADER_NFS_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_NFS_SUPPORT
+.endif
+.if ${LOADER_TFTP_SUPPORT} == "yes"
+CFLAGS+=	-DLOADER_TFTP_SUPPORT
+.endif
+
+.if !defined(NO_FORTH)
+# Enable BootForth
+BOOT_FORTH=	yes
+CFLAGS+=	-DBOOT_FORTH -I${.CURDIR}/../../ficl -I${.CURDIR}/../../ficl/arm
+LIBFICL=	${.OBJDIR}/../../ficl/libficl.a
+.endif
+
+# Always add MI sources
+.PATH:		${.CURDIR}/../../common
+.include	"${.CURDIR}/../../common/Makefile.inc"
+CFLAGS+=	-I${.CURDIR}/../../common
+CFLAGS+=	-I.
+
+CLEANFILES+=	vers.c ${PROG}.help
+
+CFLAGS+=	-ffreestanding
+
+LDFLAGS=	-nostdlib -static -T ${.CURDIR}/ldscript.arm
+
+# Pull in common loader code
+.PATH:		${.CURDIR}/../../uboot/common
+.include	"${.CURDIR}/../../uboot/common/Makefile.inc"
+CFLAGS+=	-I${.CURDIR}/../../uboot/common
+
+# U-Boot standalone support library
+LIBUBOOT=	${.OBJDIR}/../../uboot/lib/libuboot.a
+CFLAGS+=	-I${.CURDIR}/../../uboot/lib
+CFLAGS+=	-I${.OBJDIR}/../../uboot/lib
+
+# where to get libstand from
+CFLAGS+=	-I${.CURDIR}/../../../../lib/libstand/
+
+DPADD=		${LIBFICL} ${LIBUBOOT} ${LIBSTAND}
+LDADD=		${LIBFICL} ${LIBUBOOT} -lstand
+
+vers.c:	${.CURDIR}/../../common/newvers.sh ${.CURDIR}/version
+	sh ${.CURDIR}/../../common/newvers.sh ${.CURDIR}/version ${NEWVERSWHAT}
+
+${PROG}.help: help.common help.uboot
+	cat ${.ALLSRC} | \
+	    awk -f ${.CURDIR}/../../common/merge_help.awk > ${.TARGET}
+
+.PATH: ${.CURDIR}/../../forth
+FILES=	${PROG}.help
+
+.include <bsd.prog.mk>

sys/boot/arm/uboot/conf.c

@@ -0,0 +1,91 @@
+/*-
+ * Copyright (c) 2008 Semihalf, Rafal Jaworowski
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include "bootstrap.h"
+#include "libuboot.h"
+
+#if defined(LOADER_NET_SUPPORT)
+#include "dev_net.h"
+#endif
+
+struct devsw *devsw[] = {
+#if defined(LOADER_DISK_SUPPORT) || defined(LOADER_CD9660_SUPPORT)
+	&uboot_disk,
+#endif
+#if defined(LOADER_NET_SUPPORT)
+	&netdev,
+#endif
+	NULL
+};
+
+struct fs_ops *file_system[] = {
+#if defined(LOADER_UFS_SUPPORT)
+	&ufs_fsops,
+#endif
+#if defined(LOADER_CD9660_SUPPORT)
+	&cd9660_fsops,
+#endif
+#if defined(LOADER_EXT2FS_SUPPORT)
+	&ext2fs_fsops,
+#endif
+#if defined(LOADER_NFS_SUPPORT)
+	&nfs_fsops,
+#endif
+#if defined(LOADER_TFTP_SUPPORT)
+	&tftp_fsops,
+#endif
+#if defined(LOADER_GZIP_SUPPORT)
+	&gzipfs_fsops,
+#endif
+#if defined(LOADER_BZIP2_SUPPORT)
+	&bzipfs_fsops,
+#endif
+	NULL
+};
+
+struct netif_driver *netif_drivers[] = {
+#if defined(LOADER_NET_SUPPORT)
+	&uboot_net,
+#endif
+	NULL,
+};
+
+struct file_format *file_formats[] = {
+	&uboot_elf,
+	NULL
+};
+
+extern struct console uboot_console;
+
+struct console *consoles[] = {
+	&uboot_console,
+	NULL
+};

sys/boot/arm/uboot/help.uboot

@@ -0,0 +1 @@
+$FreeBSD$

sys/boot/arm/uboot/ldscript.arm

@@ -0,0 +1,134 @@
+/* $FreeBSD$ */
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  . = 0x1000000 + SIZEOF_HEADERS;
+  .interp     : { *(.interp) 	}
+  .hash          : { *(.hash)		}
+  .dynsym        : { *(.dynsym)		}
+  .dynstr        : { *(.dynstr)		}
+  .gnu.version   : { *(.gnu.version)	}
+  .gnu.version_d   : { *(.gnu.version_d)	}
+  .gnu.version_r   : { *(.gnu.version_r)	}
+  .rela.text     :
+    { *(.rela.text) *(.rela.gnu.linkonce.t*) }
+  .rela.data     :
+    { *(.rela.data) *(.rela.gnu.linkonce.d*) }
+  .rela.rodata   :
+    { *(.rela.rodata) *(.rela.gnu.linkonce.r*) }
+  .rela.got      : { *(.rela.got)		}
+  .rela.got1     : { *(.rela.got1)		}
+  .rela.got2     : { *(.rela.got2)		}
+  .rela.ctors    : { *(.rela.ctors)	}
+  .rela.dtors    : { *(.rela.dtors)	}
+  .rela.init     : { *(.rela.init)	}
+  .rela.fini     : { *(.rela.fini)	}
+  .rela.bss      : { *(.rela.bss)		}
+  .rela.plt      : { *(.rela.plt)		}
+  .rela.sdata    : { *(.rela.sdata)		}
+  .rela.sbss     : { *(.rela.sbss)		}
+  .rela.sdata2   : { *(.rela.sdata2)		}
+  .rela.sbss2    : { *(.rela.sbss2)		}
+  .text      :
+  {
+    *(.text)
+    /* .gnu.warning sections are handled specially by elf32.em.  */
+    *(.gnu.warning)
+    *(.gnu.linkonce.t*)
+  } =0
+  _etext = .;
+  PROVIDE (etext = .);
+  .init      : { *(.init)    } =0
+  .fini      : { *(.fini)    } =0
+  .rodata    : { *(.rodata) *(.gnu.linkonce.r*) }
+  .rodata1   : { *(.rodata1) }
+  .sdata2    : { *(.sdata2)  }
+  .sbss2     : { *(.sbss2)   }
+  /* Adjust the address for the data segment to the next page up. */
+  . = ((. + 0x1000) & ~(0x1000 - 1));
+  .data    :
+  {
+    *(.data)
+    *(.gnu.linkonce.d*)
+    CONSTRUCTORS
+  }
+  .data1   : { *(.data1) }
+  .got1           : { *(.got1) }
+  .dynamic        : { *(.dynamic) }
+  /* Put .ctors and .dtors next to the .got2 section, so that the pointers
+     get relocated with -mrelocatable. Also put in the .fixup pointers.
+     The current compiler no longer needs this, but keep it around for 2.7.2  */
+                PROVIDE (_GOT2_START_ = .);
+  .got2           :  { *(.got2) }
+                PROVIDE (__CTOR_LIST__ = .);
+  .ctors          : { *(.ctors) }
+                PROVIDE (__CTOR_END__ = .);
+                PROVIDE (__DTOR_LIST__ = .);
+  .dtors          : { *(.dtors) }
+                PROVIDE (__DTOR_END__ = .);
+                PROVIDE (_FIXUP_START_ = .);
+  .fixup          : { *(.fixup) }
+                PROVIDE (_FIXUP_END_ = .);
+                PROVIDE (_GOT2_END_ = .);
+                PROVIDE (_GOT_START_ = .);
+  .got            : { *(.got) }
+  .got.plt        : { *(.got.plt) }
+                PROVIDE (_GOT_END_ = .);
+  /* We want the small data sections together, so single-instruction offsets
+     can access them all, and initialized data all before uninitialized, so
+     we can shorten the on-disk segment size.  */
+  .sdata     : { *(.sdata) }
+  _edata  =  .;
+  PROVIDE (edata = .);
+  .sbss      :
+  {
+    PROVIDE (__sbss_start = .);
+    *(.sbss)
+    *(.scommon)
+    *(.dynsbss)
+    PROVIDE (__sbss_end = .);
+  }
+  .plt   : { *(.plt) }
+  .bss       :
+  {
+   PROVIDE (__bss_start = .);
+   *(.dynbss)
+   *(.bss)
+   *(COMMON)
+  }
+  _end = . ;
+  PROVIDE (end = .);
+  /* Stabs debugging sections.  */
+  .stab 0 : { *(.stab) }
+  .stabstr 0 : { *(.stabstr) }
+  /* DWARF debug sections.
+     Symbols in the DWARF debugging sections are relative to the beginning
+     of the section so we begin them at 0.  */
+  /* DWARF 1 */
+  .debug          0 : { *(.debug) }
+  .line           0 : { *(.line) }
+  /* GNU DWARF 1 extensions */
+  .debug_srcinfo  0 : { *(.debug_srcinfo) }
+  .debug_sfnames  0 : { *(.debug_sfnames) }
+  /* DWARF 1.1 and DWARF 2 */
+  .debug_aranges  0 : { *(.debug_aranges) }
+  .debug_pubnames 0 : { *(.debug_pubnames) }
+  /* DWARF 2 */
+  .debug_info     0 : { *(.debug_info) }
+  .debug_abbrev   0 : { *(.debug_abbrev) }
+  .debug_line     0 : { *(.debug_line) }
+  .debug_frame    0 : { *(.debug_frame) }
+  .debug_str      0 : { *(.debug_str) }
+  .debug_loc      0 : { *(.debug_loc) }
+  .debug_macinfo  0 : { *(.debug_macinfo) }
+  /* SGI/MIPS DWARF 2 extensions */
+  .debug_weaknames 0 : { *(.debug_weaknames) }
+  .debug_funcnames 0 : { *(.debug_funcnames) }
+  .debug_typenames 0 : { *(.debug_typenames) }
+  .debug_varnames  0 : { *(.debug_varnames) }
+  /* These must appear regardless of  .  */
+}

sys/boot/arm/uboot/start.S

@@ -0,0 +1,93 @@
+/*-
+ * Copyright (c) 2008 Semihalf, Rafal Czubak
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <machine/asm.h>
+
+/*
+ * Entry point to the loader that U-Boot passes control to.
+ */
+	.text
+	.globl	_start
+_start:
+	/* Hint where to look for the API signature */
+	ldr	ip, =uboot_address
+	str	sp, [ip]
+
+	/* Save U-Boot's r8 */
+	ldr	ip, =saved_regs
+	str	r8, [ip, #0]
+
+	/* Start loader */
+	b	main
+
+/*
+ * syscall()
+ */
+ENTRY(syscall)
+	/* Save caller's lr */
+	ldr	ip, =saved_regs
+	str	lr, [ip, #4]
+	/* Save loader's r8 */
+	ldr	ip, =saved_regs
+	str	r8, [ip, #8]
+
+	/* Restore U-Boot's r8 */
+	ldr	ip, =saved_regs
+	ldr	r8, [ip, #0]
+	/* Call into U-Boot */
+	ldr	lr, =return_from_syscall
+	ldr	ip, =syscall_ptr
+	ldr	pc, [ip]
+
+return_from_syscall:
+	/* Restore loader's r8 */
+	ldr	ip, =saved_regs
+	ldr	r8, [ip, #8]
+	/* Restore caller's lr */
+	ldr	ip, =saved_regs
+	ldr	lr, [ip, #4]
+	/* Return to caller */
+	mov	pc, lr
+
+/*
+ * Data section
+ */
+	.data
+	.align	4
+	.globl	syscall_ptr
+syscall_ptr:
+	.long	0
+
+	.globl	uboot_address
+uboot_address:
+	.long	0
+
+saved_regs:
+	.long	0	/* U-Boot's r8 */
+	.long	0	/* Loader's r8 */
+	.long	0	/* Loader's lr */

sys/boot/arm/uboot/version

@@ -0,0 +1,6 @@
+$FreeBSD$
+
+NOTE ANY CHANGES YOU MAKE TO THE BOOTBLOCKS HERE.  The format of this
+file is important.  Make sure the current version number is on line 6.
+
+0.5:	Initial U-Boot/arm version (netbooting only).

sys/boot/common/Makefile.inc

@@ -9,7 +9,7 @@ SRCS+=	load_elf32.c load_elf32_obj.c reloc_elf32.c
 SRCS+=	load_elf64.c load_elf64_obj.c reloc_elf64.c
 .elif ${MACHINE} == "pc98"
 SRCS+=	load_elf32.c load_elf32_obj.c reloc_elf32.c
-.elif ${MACHINE_ARCH} == "powerpc"
+.elif ${MACHINE_ARCH} == "powerpc" || ${MACHINE_ARCH} == "arm"
 SRCS+=	load_elf32.c reloc_elf32.c
 .elif ${MACHINE_ARCH} == "sparc64" || ${MACHINE_ARCH} == "ia64"
 SRCS+=	load_elf64.c reloc_elf64.c

sys/boot/common/load_elf.c

@@ -289,7 +289,16 @@ __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
 #ifdef ELF_VERBOSE
 	    printf("Converted entry 0x%08x\n", ehdr->e_entry);
 #endif
-	} else 
+	} else
+	    off = 0;
+#elif defined(__arm__)
+	if (off & 0xf0000000u) {
+	    off = -(off & 0xf0000000u);
+	    ehdr->e_entry += off;
+#ifdef ELF_VERBOSE
+	    printf("Converted entry 0x%08x\n", ehdr->e_entry);
+#endif
+	} else
 	    off = 0;
 #else
 	off = 0;		/* other archs use direct mapped kernels */

sys/boot/ficl/Makefile

@@ -14,7 +14,7 @@ CFLAGS+=	-mno-mmx -mno-3dnow -mno-sse -mno-sse2
 .if ${MACHINE_ARCH} == "i386"
 CFLAGS+=	-mno-sse3
 .endif
-.if ${MACHINE_ARCH} == "powerpc"
+.if ${MACHINE_ARCH} == "powerpc" || ${MACHINE_ARCH} == "arm"
 CFLAGS+=	-msoft-float
 .endif
 .if ${MACHINE} == "pc98"

sys/boot/uboot/lib/glue.c

@@ -147,7 +147,7 @@ api_search_sig(struct api_signature **sig)
 		uboot_address = 255 * 1024 * 1024;
 
 	sp = (void *)(uboot_address & ~0x000fffff);
-	spend = sp + 0x00100000 - API_SIG_MAGLEN;
+	spend = sp + 0x00300000 - API_SIG_MAGLEN;
 	while (sp < spend) {
 		if (!bcmp(sp, API_SIG_MAGIC, API_SIG_MAGLEN)) {
 			*sig = (struct api_signature *)sp;