similar to: [PATCH] Allow chain.c32 to load DRMK

DRMK (Dell Real Mode Kernel), now used in their DOS-based diagnostic images (probably about 2-4 years), has a rather unusual entry into the IO file (DELLBIO.BIN; similar to IO.SYS and IBMBIO.COM). After fumbling around with it over the last few days, I _think_ I've figured out the quirks of this entry point (and successfully tweaked chain.c32 to do such). dl Usual; drive number bp 0 cs

git://gnx.ath.cx/syslinux.git On branch for_hpa, I've got several groups of changes (listed bottom up) -chain.c32: the beginning of a DRMK loader; I still need to test this further and document/code what ones can possibly work -mtools/syslinux.c: Check to be sure fs is not NULL in case libfat_open() failed, like it can on a bad filesystem. Try to present a useful error rather than a seg

git://gnx.ath.cx/syslinux.git On branch for_hpa, I've made the changes to resolve the issue noticed by Gert Hulselmans and confirmed as a bug by hpa and also show "-d" in the extlinux installer. (2 separate commits) -- -Gene

Here is a patch that makes it possible to chainload GRUB2 core.img form chain.c32. It reuses the grub= parameter (used for chainloading GRUB Legacy stage2): - both loaded at 0x8000 - start execution at offset 0x200 (0x8200 in memory) GRUB2 allows to specify another "GRUB home dir" than the standard /boot/grub GRUB2 doesn't allow to change the configfile 'grub.cfg' name

Comments fix and usage output corrected for chain.c32 - Gert Hulselmans Signed-off-by: Gert Hulselmans <kimmik999999 at yahoo.co.uk> $ diff -u syslinux-3.84/com32/modules/chain.c.old syslinux-3.84/com32/modules/chain.c --- syslinux-3.84/com32/modules/chain.c.old 2009-12-29 01:46:34.058793767 +0100 +++ syslinux-3.84/com32/modules/chain.c 2009-12-29 01:53:41.150794351 +0100 @@ -49,7

The following patch for chain.c32 adds support to boot the Recovery Console of Windows NT/2K/XP. Normally when you want to boot the recovery console, you need to patch "cmdcons\0" into the bootsectorof the partition (8 bytes starting at 0x3 (4th byte)). We can do this patching in memory: strcpy((char *) 0x7c03, "cmdcons"); To boot the recovery console with chain.c32:

The Windows recovery console doesn't work with chain.c32 3.85 or 3.86-pre1. COM32 chain.c32 APPEND cmldr=/cmldr Initially reported by cdob at: http://www.boot-land.net/forums/index.php?showtopic=10487#entry94001 It did work fine with the: "chain.c32: Handle nonlinear logical partitions" patch. The following patch broke the recovery console hack: chain.c32: add option to set hidden

$ git log -p commit d8c5e94803fa01f0d52475a50b69681ad3135700 Author: Gert Hulselmans <kimmik999999 at yahoo.co.uk> Date: Sat Jan 9 15:30:49 2010 +0100 chain.c32: Add grldr= command for Grub4dos grldr of Grub4dos wants the partition number in DH: 0xff: whole drive 0-3: primary partitions 4-*: logical partitions diff --git a/com32/modules/chain.c

When you try to boot the FreeDOS kernel with 'fs' specified, chain.c32 won't boot the FreeDOS kernel. boot: chain.c32 fs freedos=kernel.sys Loading the boot file... Booting... Chainboot failed! boot: It would be nicer that chain.c32 will automatically correct 'fs' to 'boot' behavior, so it won't fail. msdos= will probably behave the same as freedos=. - Gert

chain.c32 of SYSLINUX 3.82 does set the boot drive passed to the DL register to 0x80 and not to the boot drive (CD-drive). This can be a problem if you want to chainload grldr (grub4dos bootloader) from a CD and if you want to let grldr search for its menu.lst file on the CD. For more info: http://www.boot-land.net/forums/index.php?showtopic=8457 This 1 line patch fixes the issue (Thanks to

Grub Legacy stage2 will read the install_partition variable from memory address 0x8208. We only need to change the value at 0x820a to the correct partition number: -1: whole drive (default) 0-3: primary partitions 4-*: logical partitions Signed-off-by: Gert Hulselmans <gerth at zytor.com> --- com32/modules/chain.c | 13 ++++++++----- 1 files changed, 8 insertions(+), 5

Improving chain.c32 help message Impact: Error message is more detailed In case of syntax error, the message is far more detailed and provides the same content as the documentation integrated in the source code. You can get this patch from Erwan's git repo: http://git.zytor.com/?p=users/erwan/hdt.git;a=commit;h=3fc3126d0c7df5701680e043c34f200166f24564 Add 'isolinux=' option to

filename to GRUB Legacy GRUB Legacy reserves 89 bytes for storing the filename of the configfile from memory address 0x8217 to 0x826f. We allow overwriting the default value (/boot/grub/menu.lst) when grubcfg=<filename> is used together with grub=<loader>. Examples: chain.c32 fs grub=/boot/grub/stage2 grubcfg=/boot/grub/grub.lst chain.c32 hd1,10 grub=/boot/grub/stage2

cat.c32: check if filename exists. Signed-off-by: Gert Hulselmans <gerth at zytor.com> --- com32/samples/cat.c | 9 +++++++-- 1 files changed, 7 insertions(+), 2 deletions(-) diff --git a/com32/samples/cat.c b/com32/samples/cat.c index 16380b0..3930f74 100644 --- a/com32/samples/cat.c +++ b/com32/samples/cat.c @@ -15,13 +15,18 @@ int main(int argc, char *argv[]) printf("argv[%d]

I wrote a new module "whichsys.c32" which detemines which command to execute, based on the Syslinux bootloader variant. In the near future it should/can be replaced by a lua script. But for people who want small binaries: whichsys.c32 is +/- eighty times smaller than lua.c32, atm. Usage: whichsys.c32 [-iso- command] [-pxe- command] [-sys- command] Examples: whichsys.c32 -iso-

The program name of the module can't be retrieved with argv[0]. I tested it by running cat.c32 (com32/samples/cat.c32). In Syslinux 3.85, argv[0] returns an empty string. In Syslinux 4.00-pre36, argv[0] returns some garbage characters. ISOLINUX 3.85 2010-02-20 ETCD Copyright (C) 1994-2010 H. Peter Anvin et al argv = 0x00182c44 argv[0] = 0x07fbffc3 = "" argv[1] = 0x00182c34 =

Op 20100708 om 14:24 schreef syslinux-bot for H. Peter Anvin: > > Update in preparation of a 4.02 release cycle. > > --- a/NEWS > +++ b/NEWS > @@ -15,6 +15,13 @@ Changes in 4.02: > stage2 of GRUB Legacy (Gert Hulselmans). > * whichsys.c32: execute specific command, based on Syslinux > bootloader variant (Gert Hulselmans). > + * lua.c32: a lot of new

'nopassany' is missing in the MEMDISK documentation: http://www.zytor.com/pipermail/syslinux-commits/2010-February/000096.html - Gert Hulselmans commit aeb2406ea701d974c85aa7fdd9af7c53106d7e48 Author: Gert Hulselmans <gerth at zytor.com> Date: Sat Mar 6 22:33:09 2010 +0100 Document 'nopassany' in MEMDISK documentation. diff --git a/doc/memdisk.txt b/doc/memdisk.txt

New module which check if the PLoP Boot Loader already has booted a CDROM or USB drive by checking for the presence of the PLoP INT13h hook. The following assembly code (NASM) can detect the PLoP INT13h hook: mov eax,'PoLP' ; Reverse of 'PLoP' mov ebp,'DKHC' ; Reverse of 'CHKD' int 13h cmp eax,' sey' ; Reverse of 'yes ' jz

H. Peter, three simple commits here[1] (for_hpa branch). Gert, sample binaries are here[2]. --- mdiskchk: Add --no-sequential mode It might be useful to suppress MDISKCHK.COM's classic behaviour of probing all BIOS drive numbers in search of MEMDISKs. Some BIOSes might not enjoy being probed. --- memdisk: Correct El Torito termination response Two