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SubjectFIXED broken (b)zImage [ was: test version of 2.1.0 available ]
Hi Linus, me again,

On Tue, 24 Sep 1996, Hans Lermen wrote:

> el16:/usr/src/linux-pre-2.1.0-2/arch/i386/boot# ls -l bzImage
> -rw-r--r-- 1 root root 5121 Sep 24 18:05 bzImage
> ^^^^
> Which is also reflected by the kernel-size variable in the bootsector.
>
> 00001e0 0d 0a 4c 6f 61 64 69 6e 67 00 00 00 00 00 00 00 ..Loading.......
> 00001f0 00 09 01 00 01 00 00 00 00 00 ff ff 02 08 55 aa ..............U.
> ^^^^^
> == 0x10 paragraphs == 0x100 bytes !!
>
> Not the right kernelsize I guess. This _must_ bomb during boot.
> I'll try to have a look at it, but sorry no promisses for this evening.

Ok, found it, in fact there are _two_ different odds:

1. My version of 'objdump' seems not to like the '-o 0xC0100000'
( have binutils 2.6.0.12, no problems compiling 2.0.21 ).
objdump -k -q -o 0xC0100000 compressed/bvmlinux > compressed/bvmlinux.out
produces:
-rwxr-xr-x 1 root root 15761 Sep 24 21:06 bvmlinux*
-rw-r--r-- 1 root root 1 Sep 24 21:07 bvmlinux.out
^^^^^
I fixed this by disabling the use of 'encaps' ( 'objcopy' works ).
Sure this is not the right solution, but it is a possible workaround.
( anyone of the binutils people listening ? )

2. When using bzImages, the uncompression loader should not be linked
to 0xC0100000 but to 0x100000 (as in 2.0.x).
So bzImages were broken.
This I fixed by using BZIMAGE_OFFSET=0x100000 again.
With these fixes I finaly could compile and load (via Loadlin) the kernel.
Further testing (sorry) wasn't impossible, because I need the AHA2940
driver :-( Anyway, the kernel is booting again.

I guess that those of us, who _succeeded_ booting 2.1.0, have been so
lucky to
a. having no broken objdump (or have no encaps)
_and_ b. have been generated a zImage.



----------------------------------------------------------------------
--- /tmp/linux/arch/i386/Makefile Tue Sep 24 23:58:34 1996
+++ linux-pre-2.1.0-2/arch/i386/Makefile Tue Sep 24 23:19:16 1996
@@ -13,6 +13,9 @@
# Copyright (C) 1994 by Linus Torvalds
#

+# if having a broken objdump, uncomment the below
+HAVE_BROKEN_OBJDUMP = 1
+
AS86 =$(CROSS_COMPILE)as86 -0 -a
AS386 =$(CROSS_COMPILE)as86 -3
LD86 =$(CROSS_COMPILE)ld86 -0
@@ -21,6 +24,10 @@
# ZIMAGE_OFFSET is the load offset of the compression loader
#
ZIMAGE_OFFSET=0x1000
+#
+# BZIMAGE_OFFSET is the load offset of the high loaded compression loader
+#
+BZIMAGE_OFFSET=0x100000

#
# IMAGE_OFFSET is the load offset of the _real_ kernel, soon
@@ -35,12 +42,18 @@
CPP=$(CC) -E -D__ELF__
OBJDUMP=$(CROSS_COMPILE)objdump
OBJDUMP_FLAGS=-k -q
+
+ifdef HAVE_BROKEN_OBJDUMP
+ENCAPS=must_hide_encaps
+else
ENCAPS=$(CROSS_COMPILE)encaps
+endif
+
OBJCOPY=$(CROSS_COMPILE)objcopy -O binary -R .note -R .comment -R .stab -R .stabstr
ZLDFLAGS=-e startup_32
LDFLAGS=-e stext
ZLINKFLAGS =-Ttext $(ZIMAGE_OFFSET) $(ZLDFLAGS)
-BZLINKFLAGS =-Ttext $(IMAGE_OFFSET) $(ZLDFLAGS)
+BZLINKFLAGS =-Ttext $(BZIMAGE_OFFSET) $(ZLDFLAGS)
LINKFLAGS =-Ttext $(IMAGE_OFFSET) $(LDFLAGS)

CFLAGS := $(CFLAGS) -pipe
----------------------------------------------------------------------

Hans
<lermen@fgan.de>


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