This patch helps to generate smaller kernel images for linux-MIPS,
Here is the effect when using lzma:
$ ls -sh vmlinux
7.1M vmlinux
$ ls -sh vmlinuz
1.5M vmlinuz
Have tested the 32bit kernel on Qemu/Malta and 64bit kernel on FuLoong
Mini PC. both of them work well. and also, tested by Alexander Clouter
on an AR7 based Linksys WAG54Gv2, and by Manuel Lauss on an Alchemy
board.
This -v2 version incorporate the feedback from Ralf, and add the
following changes:
1. add .ecoff, .bin, .erec format support
2. only enable it and the debug source code for the machines we tested
3. a dozen of fixups and cleanups
and if you want to enable it for your board, please try to select
SYS_SUPPORTS_ZBOOT for it, and if the board have an 16550 compatible
uart, you can select SYS_SUPPORTS_ZBOOT_UART16550 directly. and then
sending the relative patches to Ralf.
Tested-by: Manuel Lauss <manuel.lauss@xxxxxxxxxxxxxx>
Tested-by: Alexander Clouter <alex@xxxxxxxxxxxxx>
Signed-off-by: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
---
arch/mips/Kconfig | 14 +++
arch/mips/Makefile | 31 ++++++-
arch/mips/boot/compressed/Makefile | 100 +++++++++++++++++++++
arch/mips/boot/compressed/dbg.c | 37 ++++++++
arch/mips/boot/compressed/decompress.c | 126 +++++++++++++++++++++++++++
arch/mips/boot/compressed/dummy.c | 4 +
arch/mips/boot/compressed/head.S | 55 ++++++++++++
arch/mips/boot/compressed/ld.script | 150 ++++++++++++++++++++++++++++++++
arch/mips/boot/compressed/uart-16550.c | 43 +++++++++
9 files changed, 557 insertions(+), 3 deletions(-)
create mode 100644 arch/mips/boot/compressed/Makefile
create mode 100644 arch/mips/boot/compressed/dbg.c
create mode 100644 arch/mips/boot/compressed/decompress.c
create mode 100644 arch/mips/boot/compressed/dummy.c
create mode 100644 arch/mips/boot/compressed/head.S
create mode 100644 arch/mips/boot/compressed/ld.script
create mode 100644 arch/mips/boot/compressed/uart-16550.c
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9da6a52..96bb02d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -21,6 +21,7 @@ choice
config MACH_ALCHEMY
bool "Alchemy processor based machines"
+ select SYS_SUPPORTS_ZBOOT
config AR7
bool "Texas Instruments AR7"
@@ -35,6 +36,7 @@ config AR7
select SYS_HAS_EARLY_PRINTK
select SYS_SUPPORTS_32BIT_KERNEL
select SYS_SUPPORTS_LITTLE_ENDIAN
+ select SYS_SUPPORTS_ZBOOT_UART16550
select GENERIC_GPIO
select GCD
select VLYNQ
@@ -191,6 +193,7 @@ config LASAT
config MACH_LOONGSON
bool "Loongson family of machines"
+ select SYS_SUPPORTS_ZBOOT_UART16550
help
This enables the support of Loongson family of machines.
@@ -232,6 +235,7 @@ config MIPS_MALTA
select SYS_SUPPORTS_MIPS_CMP
select SYS_SUPPORTS_MULTITHREADING
select SYS_SUPPORTS_SMARTMIPS
+ select SYS_SUPPORTS_ZBOOT
help
This enables support for the MIPS Technologies Malta evaluation
board.
@@ -1294,6 +1298,16 @@ config CPU_CAVIUM_OCTEON
endchoice
+config SYS_SUPPORTS_ZBOOT
+ bool
+ select HAVE_KERNEL_GZIP
+ select HAVE_KERNEL_BZIP2
+ select HAVE_KERNEL_LZMA
+
+config SYS_SUPPORTS_ZBOOT_UART16550
+ bool
+ select SYS_SUPPORTS_ZBOOT
+
config CPU_LOONGSON2
bool
select CPU_SUPPORTS_32BIT_KERNEL
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index d45e596..ccd713d 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -69,6 +69,7 @@ endif
all-$(CONFIG_BOOT_ELF32) := $(vmlinux-32)
all-$(CONFIG_BOOT_ELF64) := $(vmlinux-64)
+all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
#
# GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel
@@ -336,7 +337,7 @@ load-$(CONFIG_LEMOTE_YEELOONG2F) +=0xffffffff80200000
core-$(CONFIG_MIPS_MALTA) += arch/mips/mti-malta/
cflags-$(CONFIG_MIPS_MALTA) += -I$(srctree)/arch/mips/include/asm/mach-malta
load-$(CONFIG_MIPS_MALTA) += 0xffffffff80100000
-all-$(CONFIG_MIPS_MALTA) := vmlinux.bin
+all-$(CONFIG_MIPS_MALTA) := vmlinuz.bin
#
# MIPS SIM
@@ -586,7 +587,7 @@ load-$(CONFIG_SNI_RM) += 0xffffffff80600000
else
load-$(CONFIG_SNI_RM) += 0xffffffff80030000
endif
-all-$(CONFIG_SNI_RM) := vmlinux.ecoff
+all-$(CONFIG_SNI_RM) := vmlinuz.ecoff
#
# Common TXx9
@@ -704,9 +705,23 @@ vmlinux.64: vmlinux
$(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
makeboot =$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) $(1)
+makezboot =$(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
+ VMLINUX_LOAD_ADDRESS=$(load-y) 32bit-bfd=$(32bit-bfd) $(1)
all: $(all-y)
+vmlinuz: vmlinux
+ +@$(call makezboot,$@)
+
+vmlinuz.bin: vmlinux
+ +@$(call makezboot,$@)
+
+vmlinuz.ecoff: vmlinux
+ +@$(call makezboot,$@)
+
+vmlinuz.srec: vmlinux
+ +@$(call makezboot,$@)
+
vmlinux.bin: $(vmlinux-32)
+@$(call makeboot,$@)
@@ -731,11 +746,13 @@ endif
install:
$(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
+ $(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
archclean:
@$(MAKE) $(clean)=arch/mips/boot
+ @$(MAKE) $(clean)=arch/mips/boot/compressed
@$(MAKE) $(clean)=arch/mips/lasat
define archhelp
@@ -743,10 +760,18 @@ define archhelp
echo ' vmlinux.ecoff - ECOFF boot image'
echo ' vmlinux.bin - Raw binary boot image'
echo ' vmlinux.srec - SREC boot image'
+ echo ' vmlinuz - Compressed boot(zboot) image'
+ echo ' vmlinuz.ecoff - ECOFF zboot image'
+ echo ' vmlinuz.bin - Raw binary zboot image'
+ echo ' vmlinuz.srec - SREC zboot image'
echo
echo ' These will be default as apropriate for a configured platform.'
endef
CLEAN_FILES += vmlinux.32 \
vmlinux.64 \
- vmlinux.ecoff
+ vmlinux.ecoff \
+ vmlinuz \
+ vmlinuz.ecoff \
+ vmlinuz.bin \
+ vmlinuz.srec
diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
new file mode 100644
index 0000000..140bd9b
--- /dev/null
+++ b/arch/mips/boot/compressed/Makefile
@@ -0,0 +1,100 @@
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.
+#
+# Adapted for MIPS Pete Popov, Dan Malek
+#
+# Copyright (C) 1994 by Linus Torvalds
+# Adapted for PowerPC by Gary Thomas
+# modified by Cort (cort@xxxxxxxxxx)
+#
+# Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University
+# Author: Wu Zhangjin <wuzj@xxxxxxxxxx>
+#
+
+# compressed kernel load addr: VMLINUZ_LOAD_ADDRESS > VMLINUX_LOAD_ADDRESS + VMLINUX_SIZE
+VMLINUX_SIZE := $(shell wc -c $(objtree)/$(KBUILD_IMAGE) 2>/dev/null | cut -d' ' -f1)
+VMLINUX_SIZE := $(shell [ -n "$(VMLINUX_SIZE)" ] && echo $$(($(VMLINUX_SIZE) + (65536 - $(VMLINUX_SIZE) % 65536))))
+VMLINUZ_LOAD_ADDRESS := 0x$(shell [ -n "$(VMLINUX_SIZE)" ] && printf %x $$(($(VMLINUX_LOAD_ADDRESS) + $(VMLINUX_SIZE))))
+
+# set the default size of the mallocing area for decompressing
+BOOT_HEAP_SIZE := 0x400000
+
+KBUILD_CFLAGS := $(LINUXINCLUDE) $(KBUILD_CFLAGS) -D__KERNEL__ \
+ -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull" \
+
+KBUILD_AFLAGS := $(LINUXINCLUDE) $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
+ -DKERNEL_ENTRY=0x$(shell $(NM) $(objtree)/$(KBUILD_IMAGE) 2>/dev/null | grep " kernel_entry" | cut -f1 -d \ ) \
+ -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE)
+
+obj-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o
+
+obj-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
+
+OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
+$(obj)/vmlinux.bin: $(KBUILD_IMAGE)
+ $(call if_changed,objcopy)
+
+suffix_$(CONFIG_KERNEL_GZIP) = gz
+suffix_$(CONFIG_KERNEL_BZIP2) = bz2
+suffix_$(CONFIG_KERNEL_LZMA) = lzma
+tool_$(CONFIG_KERNEL_GZIP) = gzip
+tool_$(CONFIG_KERNEL_BZIP2) = bzip2
+tool_$(CONFIG_KERNEL_LZMA) = lzma
+$(obj)/vmlinux.$(suffix_y): $(obj)/vmlinux.bin
+ $(call if_changed,$(tool_y))
+ $(Q)rm -f $<
+
+$(obj)/piggy.o: $(obj)/vmlinux.$(suffix_y) $(obj)/dummy.o
+ $(Q)$(OBJCOPY) $(OBJCOPYFLAGS) \
+ --add-section=.image=$< \
+ --set-section-flags=.image=contents,alloc,load,readonly,data \
+ $(obj)/dummy.o $@
+ $(Q)rm -f $<
+
+LDFLAGS_vmlinuz := $(LDFLAGS) -Ttext $(VMLINUZ_LOAD_ADDRESS) -T
+vmlinuz: $(src)/ld.script $(obj-y) $(obj)/piggy.o
+ $(call if_changed,ld)
+ $(Q)$(OBJCOPY) $(OBJCOPYFLAGS) -R .comment -R .stab -R .stabstr -R .initrd -R .sysmap $@
+ $(Q)rm -f $(obj)/piggy.o
+
+#
+# Some DECstations need all possible sections of an ECOFF executable
+#
+ifdef CONFIG_MACH_DECSTATION
+ E2EFLAGS = -a
+else
+ E2EFLAGS =
+endif
+
+# elf2ecoff can only handle 32bit image
+
+ifdef CONFIG_32BIT
+ VMLINUZ = vmlinuz
+else
+ VMLINUZ = vmlinuz.32
+endif
+
+vmlinuz.32: vmlinuz
+ $(Q)$(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
+
+vmlinuz.ecoff: $(obj)/../elf2ecoff $(VMLINUZ)
+ $(Q)$(obj)/../elf2ecoff $(VMLINUZ) vmlinuz.ecoff $(E2EFLAGS)
+
+$(obj)/../elf2ecoff: $(src)/../elf2ecoff.c
+ $(Q)$(HOSTCC) -o $@ $^
+
+drop-sections = .reginfo .mdebug .comment .note .pdr .options .MIPS.options
+strip-flags = $(addprefix --remove-section=,$(drop-sections))
+
+OBJCOPYFLAGS_vmlinuz.bin := $(OBJCOPYFLAGS) -O binary $(strip-flags)
+vmlinuz.bin: vmlinuz
+ $(call if_changed,objcopy)
+
+OBJCOPYFLAGS_vmlinuz.srec := $(OBJCOPYFLAGS) -S -O srec $(strip-flags)
+vmlinuz.srec: vmlinuz
+ $(call if_changed,objcopy)
+
+clean:
+clean-files += *.o \
+ vmlinu*
diff --git a/arch/mips/boot/compressed/dbg.c b/arch/mips/boot/compressed/dbg.c
new file mode 100644
index 0000000..ff4dc7a
--- /dev/null
+++ b/arch/mips/boot/compressed/dbg.c
@@ -0,0 +1,37 @@
+/*
+ * MIPS-specific debug support for pre-boot environment
+ *
+ * NOTE: putc() is board specific, if your board have a 16550 compatible uart,
+ * please select SYS_SUPPORTS_ZBOOT_UART16550 for your machine. othewise, you
+ * need to implement your own putc().
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+
+void __attribute__ ((weak)) putc(char c)
+{
+}
+
+void puts(const char *s)
+{
+ char c;
+ while ((c = *s++) != '\0') {
+ putc(c);
+ if (c == '\n')
+ putc('\r');
+ }
+}
+
+void puthex(unsigned long long val)
+{
+
+ unsigned char buf[10];
+ int i;
+ for (i = 7; i >= 0; i--) {
+ buf[i] = "0123456789ABCDEF"[val & 0x0F];
+ val >>= 4;
+ }
+ buf[8] = '\0';
+ puts(buf);
+}
diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
new file mode 100644
index 0000000..67330c2
--- /dev/null
+++ b/arch/mips/boot/compressed/decompress.c
@@ -0,0 +1,126 @@
+/*
+ * Misc. bootloader code for many machines.
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: Matt Porter <mporter@xxxxxxxxxx> Derived from
+ * arch/ppc/boot/prep/misc.c
+ *
+ * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
+ * Author: Wu Zhangjin <wuzj@xxxxxxxxxx>
+ *
+ * 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 <linux/types.h>
+#include <linux/kernel.h>
+
+#include <asm/addrspace.h>
+
+/* These two variables specify the free mem region
+ * that can be used for temporary malloc area
+ */
+unsigned long free_mem_ptr;
+unsigned long free_mem_end_ptr;
+char *zimage_start;
+
+/* The linker tells us where the image is. */
+extern unsigned char __image_begin, __image_end;
+extern unsigned char __ramdisk_begin, __ramdisk_end;
+unsigned long initrd_size;
+
+/* debug interfaces */
+extern void puts(const char *s);
+extern void puthex(unsigned long long val);
+
+void error(char *x)
+{
+ puts("\n\n");
+ puts(x);
+ puts("\n\n -- System halted");
+
+ while (1)
+ ; /* Halt */
+}
+
+/* activate the code for pre-boot environment */
+#define STATIC static
+
+#ifdef CONFIG_KERNEL_GZIP
+void *memcpy(void *dest, const void *src, size_t n)
+{
+ int i;
+ const char *s = src;
+ char *d = dest;
+
+ for (i = 0; i < n; i++)
+ d[i] = s[i];
+ return dest;
+}
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_BZIP2
+void *memset(void *s, int c, size_t n)
+{
+ int i;
+ char *ss = s;
+
+ for (i = 0; i < n; i++)
+ ss[i] = c;
+ return s;
+}
+#include "../../../../lib/decompress_bunzip2.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+void decompress_kernel(unsigned long boot_heap_start)
+{
+ int zimage_size;
+
+ /*
+ * We link ourself to an arbitrary low address. When we run, we
+ * relocate outself to that address. __image_beign points to
+ * the part of the image where the zImage is. -- Tom
+ */
+ zimage_start = (char *)(unsigned long)(&__image_begin);
+ zimage_size = (unsigned long)(&__image_end) -
+ (unsigned long)(&__image_begin);
+
+ /*
+ * The zImage and initrd will be between start and _end, so they've
+ * already been moved once. We're good to go now. -- Tom
+ */
+ puts("zimage at: ");
+ puthex((unsigned long)zimage_start);
+ puts(" ");
+ puthex((unsigned long)(zimage_size + zimage_start));
+ puts("\n");
+
+ if (initrd_size) {
+ puts("initrd at: ");
+ puthex((unsigned long)(&__ramdisk_begin));
+ puts(" ");
+ puthex((unsigned long)(&__ramdisk_end));
+ puts("\n");
+ }
+
+ /* this area are prepared for mallocing when decompressing */
+ free_mem_ptr = boot_heap_start;
+ free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
+
+ /* Display standard Linux/MIPS boot prompt for kernel args */
+ puts("Uncompressing Linux at load address ");
+ puthex(VMLINUX_LOAD_ADDRESS_ULL);
+ puts("\n");
+ /* Decompress the kernel with according algorithm */
+ decompress(zimage_start, zimage_size, 0, 0,
+ (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
+ /* FIXME: is there a need to flush cache here? */
+ puts("Now, booting the kernel...\n");
+}
diff --git a/arch/mips/boot/compressed/dummy.c b/arch/mips/boot/compressed/dummy.c
new file mode 100644
index 0000000..31dbf45
--- /dev/null
+++ b/arch/mips/boot/compressed/dummy.c
@@ -0,0 +1,4 @@
+int main(void)
+{
+ return 0;
+}
diff --git a/arch/mips/boot/compressed/head.S b/arch/mips/boot/compressed/head.S
new file mode 100644
index 0000000..e23f25e
--- /dev/null
+++ b/arch/mips/boot/compressed/head.S
@@ -0,0 +1,55 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 1995 Waldorf Electronics
+ * Written by Ralf Baechle and Andreas Busse
+ * Copyright (C) 1995 - 1999 Ralf Baechle
+ * Copyright (C) 1996 Paul M. Antoine
+ * Modified for DECStation and hence R3000 support by Paul M. Antoine
+ * Further modifications by David S. Miller and Harald Koerfgen
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ */
+
+#include <asm/asm.h>
+#include <asm/regdef.h>
+
+ .set noreorder
+ .cprestore
+ LEAF(start)
+start:
+ /* Save boot rom start args */
+ move s0, a0
+ move s1, a1
+ move s2, a2
+ move s3, a3
+
+ /* Clear BSS */
+ PTR_LA a0, _edata
+ PTR_LA a2, _end
+1: sw zero, 0(a0)
+ bne a2, a0, 1b
+ addu a0, 4
+
+ PTR_LA a0, (.heap) /* heap address */
+ PTR_LA sp, (.stack + 8192) /* stack address */
+
+ PTR_LA ra, 2f
+ PTR_LA k0, decompress_kernel
+ jr k0
+ nop
+2:
+ move a0, s0
+ move a1, s1
+ move a2, s2
+ move a3, s3
+ PTR_LI k0, KERNEL_ENTRY
+ jr k0
+ nop
+3:
+ b 3b
+ END(start)
+
+ .comm .heap,BOOT_HEAP_SIZE,4
+ .comm .stack,4096*2,4
diff --git a/arch/mips/boot/compressed/ld.script b/arch/mips/boot/compressed/ld.script
new file mode 100644
index 0000000..29e9f4c
--- /dev/null
+++ b/arch/mips/boot/compressed/ld.script
@@ -0,0 +1,150 @@
+OUTPUT_ARCH(mips)
+ENTRY(start)
+SECTIONS
+{
+ /* Read-only sections, merged into text segment: */
+ .init : { *(.init) } =0
+ .text :
+ {
+ _ftext = . ;
+ *(.text)
+ *(.rodata)
+ *(.rodata1)
+ /* .gnu.warning sections are handled specially by elf32.em. */
+ *(.gnu.warning)
+ } =0
+ .kstrtab : { *(.kstrtab) }
+
+ . = ALIGN(16); /* Exception table */
+ __start___ex_table = .;
+ __ex_table : { *(__ex_table) }
+ __stop___ex_table = .;
+
+ __start___dbe_table = .; /* Exception table for data bus errors */
+ __dbe_table : { *(__dbe_table) }
+ __stop___dbe_table = .;
+
+ __start___ksymtab = .; /* Kernel symbol table */
+ __ksymtab : { *(__ksymtab) }
+ __stop___ksymtab = .;
+
+ _etext = .;
+
+ . = ALIGN(8192);
+ .data.init_task : { *(.data.init_task) }
+
+ /* Startup code */
+ . = ALIGN(4096);
+ __init_begin = .;
+ .text.init : { *(.text.init) }
+ .data.init : { *(.data.init) }
+ . = ALIGN(16);
+ __setup_start = .;
+ .setup.init : { *(.setup.init) }
+ __setup_end = .;
+ __initcall_start = .;
+ .initcall.init : { *(.initcall.init) }
+ __initcall_end = .;
+ . = ALIGN(4096); /* Align double page for init_task_union */
+ __init_end = .;
+
+ . = ALIGN(4096);
+ .data.page_aligned : { *(.data.idt) }
+
+ . = ALIGN(32);
+ .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+
+ .fini : { *(.fini) } =0
+ .reginfo : { *(.reginfo) }
+ /* Adjust the address for the data segment. We want to adjust up to
+ the same address within the page on the next page up. It would
+ be more correct to do this:
+ . = .;
+ The current expression does not correctly handle the case of a
+ text segment ending precisely at the end of a page; it causes the
+ data segment to skip a page. The above expression does not have
+ this problem, but it will currently (2/95) cause BFD to allocate
+ a single segment, combining both text and data, for this case.
+ This will prevent the text segment from being shared among
+ multiple executions of the program; I think that is more
+ important than losing a page of the virtual address space (note
+ that no actual memory is lost; the page which is skipped can not
+ be referenced). */
+ . = .;
+ .data :
+ {
+ _fdata = . ;
+ *(.data)
+
+ /* Put the compressed image here, so bss is on the end. */
+ __image_begin = .;
+ *(.image)
+ __image_end = .;
+ /* Align the initial ramdisk image (INITRD) on page boundaries. */
+ . = ALIGN(4096);
+ __ramdisk_begin = .;
+ *(.initrd)
+ __ramdisk_end = .;
+ . = ALIGN(4096);
+
+ CONSTRUCTORS
+ }
+ .data1 : { *(.data1) }
+ _gp = . + 0x8000;
+ .lit8 : { *(.lit8) }
+ .lit4 : { *(.lit4) }
+ .ctors : { *(.ctors) }
+ .dtors : { *(.dtors) }
+ .got : { *(.got.plt) *(.got) }
+ .dynamic : { *(.dynamic) }
+ /* 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) }
+ . = ALIGN(4);
+ _edata = .;
+ PROVIDE (edata = .);
+
+ __bss_start = .;
+ _fbss = .;
+ .sbss : { *(.sbss) *(.scommon) }
+ .bss :
+ {
+ *(.dynbss)
+ *(.bss)
+ *(COMMON)
+ . = ALIGN(4);
+ _end = . ;
+ PROVIDE (end = .);
+ }
+
+ /* Sections to be discarded */
+ /DISCARD/ :
+ {
+ *(.text.exit)
+ *(.data.exit)
+ *(.exitcall.exit)
+ }
+
+ /* This is the MIPS specific mdebug section. */
+ .mdebug : { *(.mdebug) }
+ /* These are needed for ELF backends which have not yet been
+ converted to the new style linker. */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ /* DWARF debug sections.
+ Symbols in the .debug DWARF section are relative to the beginning of the
+ section so we begin .debug at 0. It's not clear yet what needs to happen
+ for the others. */
+ .debug 0 : { *(.debug) }
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ .line 0 : { *(.line) }
+ /* These must appear regardless of . */
+ .gptab.sdata : { *(.gptab.data) *(.gptab.sdata) }
+ .gptab.sbss : { *(.gptab.bss) *(.gptab.sbss) }
+ .comment : { *(.comment) }
+ .note : { *(.note) }
+}
diff --git a/arch/mips/boot/compressed/uart-16550.c b/arch/mips/boot/compressed/uart-16550.c
new file mode 100644
index 0000000..c9caaf4
--- /dev/null
+++ b/arch/mips/boot/compressed/uart-16550.c
@@ -0,0 +1,43 @@
+/*
+ * 16550 compatible uart based serial debug support for zboot
+ */
+
+#include <linux/types.h>
+#include <linux/serial_reg.h>
+#include <linux/init.h>
+
+#include <asm/addrspace.h>
+
+#if defined(CONFIG_MACH_LOONGSON) || defined(CONFIG_MIPS_MALTA)
+#define UART_BASE 0x1fd003f8
+#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
+#endif
+
+#ifdef CONFIG_AR7
+#include <ar7.h>
+#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
+#endif
+
+#ifndef PORT
+#error please define the serial port address for your own machine
+#endif
+
+static inline unsigned int serial_in(int offset)
+{
+ return *((char *)PORT(offset));
+}
+
+static inline void serial_out(int offset, int value)
+{
+ *((char *)PORT(offset)) = value;
+}
+
+void putc(char c)
+{
+ int timeout = 1024;
+
+ while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
+ ;
+
+ serial_out(UART_TX, c);
+}
--
1.6.2.1
