181 lines
4.4 KiB
Diff
181 lines
4.4 KiB
Diff
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diff --git a/Makefile b/Makefile
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index 76abff5..7d00782 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -66,7 +66,7 @@ INSTALL_SBIN = extlinux/extlinux
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# Things to install in /usr/lib/syslinux
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INSTALL_AUX = core/pxelinux.0 gpxe/gpxelinux.0 core/isolinux.bin \
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core/isolinux-debug.bin \
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- dos/syslinux.com dos/copybs.com win32/syslinux.exe \
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+ dos/syslinux.com dos/copybs.com \
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mbr/*.bin $(MODULES)
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INSTALL_AUX_OPT = win32/syslinux.exe
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diff --git a/core/Makefile b/core/Makefile
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index 65418c4..fbb38b5 100644
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--- a/core/Makefile
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+++ b/core/Makefile
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@@ -66,6 +66,7 @@ kwdhash.gen: keywords genhash.pl
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iso%.bin: iso%.elf checksumiso.pl
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$(OBJCOPY) -O binary $< $@
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$(PERL) checksumiso.pl $@
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+ -./add_crc $@
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# Standard rule for {ldlinux,pxelinux,extlinux}.bin
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%.bin: %.elf
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diff --git a/core/add_crc b/core/add_crc
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new file mode 100755
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index 0000000..0da2307
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--- /dev/null
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+++ b/core/add_crc
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@@ -0,0 +1,57 @@
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+#! /usr/bin/perl
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+
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+use integer;
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+
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+# for isolinux
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+#
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+# Ensure checksum over (first sector - 64 bytes) [internally: FirstSecSum]
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+# is 0 by adjusting the variable csum_value.
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+#
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+# Though isolinux checks the integrity with a separate checksum after all
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+# data has been loaded this does not help with BIOSes that don't get even
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+# the first 2k right. Hence this additional check. :-(
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+#
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+
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+$file = shift;
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+$list = "$file";
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+$list =~ s/\.bin$/.lsr/;
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+
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+open F, $list;
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+
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+while(<F>) {
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+ if(/^\s*\d+\s*(\S+)\s*0+\s*(\<\d+\>\s*)?csum_value\s*dd\s*0/) {
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+ $ofs = hex $1;
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+ }
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+}
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+close F;
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+
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+die "oops 1\n" unless $ofs && !($ofs & 3);
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+
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+# print "$ofs\n";
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+
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+open F, $file or die "$file: $!\n";
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+
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+$file_size = -s $file;
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+
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+sysread F, $buf, $file_size;
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+
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+close F;
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+
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+die "oops 1\n" if $file_size != length($buf);
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+
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+@x = unpack "V512", $buf;
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+
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+for ($sum = 0, $i = 16; $i < 512; $i++) {
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+ $sum += $x[$i];
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+}
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+
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+# printf "0x%08x\n", $sum;
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+
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+$ns = pack "V", -$sum;
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+
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+substr($buf, $ofs, 4) = $ns;
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+
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+open F, ">$file" or die "$file: $!\n";
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+
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+syswrite F, $buf;
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+
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diff --git a/core/isolinux.asm b/core/isolinux.asm
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index a0910fb..c947846 100644
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--- a/core/isolinux.asm
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+++ b/core/isolinux.asm
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@@ -308,6 +308,22 @@ initial_csum: xor edi,edi
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mov [FirstSecSum],edi
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mov [DriveNumber],dl
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+
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+ ; check whether the BIOS did load us correctly
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+ cmp dl,80h ; some BIOSes try to do floppy emulation...
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+ jb bios_err
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+ cmp dword [FirstSecSum], byte 0
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+ jmp bios_ok ; ##############
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+ jz bios_ok
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+bios_err:
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+ mov si,broken_bios_msg
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+ call writemsg
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+ jmp short $
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+broken_bios_msg db 13, 10, 'Cannot boot from this CD. Please try a BIOS update.', 13, 10, 0
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+ align 4
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+csum_value dd 0
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+bios_ok:
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+
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%ifdef DEBUG_MESSAGES
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mov si,startup_msg
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call writemsg
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@@ -336,6 +352,9 @@ initial_csum: xor edi,edi
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cmp word [BIOSType],bios_cdrom
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jne found_drive ; If so, no spec packet...
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+%if 0
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+ ; Some BIOSes don't like that call.
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+
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; Now figure out what we're actually doing
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; Note: use passed-in DL value rather than 7Fh because
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; at least some BIOSes will get the wrong value otherwise
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@@ -356,6 +375,8 @@ initial_csum: xor edi,edi
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call crlf
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%endif
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+%endif
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+
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found_drive:
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; Alright, we have found the drive. Now, try to find the
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; boot file itself. If we have a boot info table, life is
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@@ -480,6 +501,9 @@ integrity_ok:
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%endif
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jmp all_read ; Jump to main code
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+%if 0
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+ ; doesn't work anyway, see above
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+
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Start of BrokenAwardHack --- 10-nov-2002 Knut_Petersen@t-online.de
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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@@ -671,6 +695,7 @@ spec_query_failed:
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mov si,trysbm_msg
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call writemsg
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jmp .found_drive ; Pray that this works...
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+%endif
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fatal_error:
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mov si,nothing_msg
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@@ -936,8 +961,18 @@ maxtrans:
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getlinsec_cdrom:
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mov si,dapa ; Load up the DAPA
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mov [si+4],bx
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- mov [si+6],es
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mov [si+8],eax
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+
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+ ; seems that some BIOSes have problems if the target
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+ ; segment is 0 (don't ask); to avoid this, we normalize
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+ ; the buffer address here
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+ ; -> seen on Acer TravelMate C102Ti
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+ and word [si+4],0fh
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+ mov ax,es
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+ shr bx,4
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+ add ax,bx
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+ mov [si+6],ax
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+
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.loop:
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push bp ; Sectors left
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cmp bp,[MaxTransferCD]
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@@ -1770,6 +1805,7 @@ default_str db 'default', 0
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default_len equ ($-default_str)
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boot_dir db '/boot' ; /boot/isolinux
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isolinux_dir db '/isolinux', 0
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+zb 64
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config_name db 'isolinux.cfg', 0
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err_disk_image db 'Cannot load disk image (invalid file)?', CR, LF, 0
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