[syslinux] MEMDISK issue with OptiPlex GX280,620

Jason Vasquez jvasquez at kennesaw.edu
Tue Jan 25 10:36:31 PST 2011


Gladly yes to test, thank you.

System used: OptiPlex GX280, BIOS A08. Results below.

command line: initrd=images/misc/c.img BOOT_IMAGE=memdisk_memdskprobedbg
Disk is hd0, 10404 K, C/H/S = 306/4/17 (MBR/MBR), EDD on, rw
Using safe INT 15h access to high memory
Code 1744, meminfo 276, cmdline 66, stack 512
Total size needed = 2598 bytes, allocating 3K
Old dos memory at 0x9fc00 (map says 0xa0000), loading at 0x9f000
1588: 0xffff  15E801: 0x3c00 0x7dc3
INT 13 08: Success, count = 1, BPT = 0000:0000
INT 13 DL80:
  AH08: CF1 BL00 DL01
  AH15: CF1 AH03
  AH41: CF1 BXaa55 AH30 DH00
BDA drive 80? 1, total count: 1
Press a key to continue...
INT 13 DL81:
  AH08: CF0 BL00 DL00
  AH15: CF1 AH00
  AH41: CF0 BX55aa AH01 DH00
BDA drive 81? 0, total count: 1
Press a key to continue...
INT 13 DL82:
  AH08: CF0 BL00 DL00
  AH15: CF1 AH00
  AH41: CF0 BX55aa AH01 DH00
BDA drive 82? 0, total count: 1
Press a key to continue...
.
.
.
INT 13 DLff:
  AH08: CF0 BL00 DL00
  AH15: CF1 AH00
  AH41: CF0 BX55aa AH01 DH00
BDA drive ff? 0, total count: 1
Press a key to continue...
We lost the last drive in our class of drives.
Drive probing gives drive shift limit: 0x01
old: int13 = f0005c6f int15 = f000f859 int1e = f000efc7
new: int13 = 9f00000a int15 = 9f0003ba int1e = f000efc7
Loading boot sector... press any key to boot...


----- Original Message -----
From: "Shao Miller" <Shao.Miller at yrdsb.edu.on.ca>
To: syslinux at zytor.com
Sent: Tuesday, January 25, 2011 11:23:37 AM GMT -05:00 US/Canada Eastern
Subject: Re: [syslinux] MEMDISK issue with OptiPlex GX280,620

On 1/24/2011 23:53, Shao Miller wrote:
> ...Other than that trivial piece, I've split the three types of probe, 
> 0x08, 0x15, 0x41, so each can yield more specific detail relevant to 
> the results for the particular sub-function.  No commits for that 
> stuff just yet, but perhaps tomorrow...

Jason Vasquez, would you be so kind as to test:

   
http://git.zytor.com/?p=users/sha0/syslinux.git;a=blob;f=memdisk/memdskprobedbg;h=430ed86de8846d494f47b8a7fbddf6a261ab8e71;hb=4a54740c4a390d6b1d1ba31c4bb4377ce00a295c

?  This build includes some new debugging.  Please report the new "INT 
13 DLXX:" sections until they all begin to look the same.  They will 
start to look the same after only a few (maybe three) iterations.

H. Peter: A second commit (yesterday saw a first commit) to my 
memdskprobe branch, which yields a bit more debugging output for our 
disk probing, iff DBG_DSKPROBE is #defined to 1.

   
http://git.zytor.com/?p=users/sha0/syslinux.git;a=commitdiff;h=6632db7283564fbcf9131c2877f6a1398af81424

- Shao Miller
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