China DOS Union

There is already an online forum for grub4dos established on Google, with the address as follows:

http://groups.google.com/group/grub4dos?hl=zh-CN

The way to post in the above online forum is to send an email to: grub4dos@googlegroups.com

The following are several websites where you can download grub4dos:

http://grub4dos.nufans.net/
http://download.gna.org/grub4dos/
http://grub4dos.sourceforge.net/grub4dos/
http://sarovar.org/projects/grub4dos/
http://grub4dos.jot.com/ (no longer accessible)

Update:The original content of http://grub4dos.jot.com/ has been moved to the Google Sites platform http://sites.google.com/site/grubdos/

Here is the index address of some projects related to "boot disks" (grub4dos is also included among them):

http://www.softpedia.com/get/System/Boot-Manager-Disk/
http://linux.softpedia.com/get/System/Boot/


The following is the URL of the Chinese support forum (Sysoft Shikong Forum):

http://bbs.znpc.net/

Our English support forum has been set up here:
http://www.boot-land.net/forums/?showforum=66

[ Last edited by 不点 on 2008-12-1 at 11:45 ]

Not even an advertisement...

This version has been downloaded.

It seems that GRUB4DOS doesn't support USB-CDROM very well?
Or is it a motherboard issue?
Using ISOLINUX is fine, but when using GRUB to boot, the CDROM can't be found.

A VIA motherboard can work normally, but on an INTEL 865G motherboard, after using GRUB to boot, the USB-CDROM can't be found.
root +TAB can see a cd, but
root (cd)/ prompts that the partition doesn't exist.

Tried from very early versions and it doesn't work.
Note: This USB-CDROM is formatted from a U3 USB flash drive.

I booted from USB-CDROM, used ISOLINUX as the bootloader, and everything was normal.
There's a problem with GRUB..

What information needs to be submitted?

[ Last edited by chenall on 2007-7-10 at 08:50 PM ]

Another question, compared with the old version, the loading speed of the new version seems a bit slower.

Using the same menu file of the old version, it passes quickly, while the new version may be slower by one or two seconds.

It seems that GRUB4DOS doesn't support USB - CDROM very well? It was said a year or two ago.

grub4dos accesses hardware using BIOS. If BIOS doesn't support hardware access to the device, then grub4dos can't either.

However, from the following information you provided, it seems the problem is not too serious:

root +TAB can see a cd, but root (cd)/ prompts that the partition doesn't exist.

Suspect it's a problem with the CD's data structure. grub4dos only supports Rock Ridge format CDs, not Joliet format.

If you don't think it's a data structure problem, you can do more debugging and post the results. For example:

debug on

geometry (cd)

root (cd)

cat --hex (cd)16+4

[ Last edited by 不点 on 2007-7-11 at 10:12 AM ]

I can work normally on another VIA motherboard. There was also an 845G motherboard that could work before.
Now an 865G can only boot to the command line.

>debug on

>geometry (cd)

int 13/41(9F),version=0,int 13/4B01 (9F),err-1,drive=9F,int 13/48(9F),err=1,

C/H/S=0/0/0,Sector count/Size=0/0,int 13/08(9F),version=1,C/H/S=65536/255/15

Selected disk does not exist

>root (cd)

int 13/41(9F),version=0,int 13/4B01 (9F),err-1,drive=9F,int 13/48(9F),err=1,

C/H/S=0/0/0,Sector count/Size=0/0,int 13/08(9F),version=1,C/H/S=16383/255/63

Selected disk does not exist

>cat --hex (cd)16+4

The same as above.

After another test, I changed the file format of the CD from Joliet to Rock Ridge. The re - test is still the same.

[ Last edited by chenall on 2007-7-11 at 12:01 PM ]

Here is the translation:

Here are the results on a normal working computer.

>oot (cd)

int 13/41(EF),version=AA300005,int 13/4B01(EF),err=0,drive=EF,filesystem is iso9600 use whole disk

>geometry (cd)

int 13/41(EF),version=AA300005,int 13/4B01(EF),err=0,drive 0xEF(LBA):C/H/S=65536/255/15, Sector Count/Size=250675200/2048

It seems to be a BIOS issue.

The one that succeeded has a complete BIOS, and the one that failed has a damaged BIOS.

We can see its contradictory reports:

C/H/S=65536/255/15
C/H/S=16383/255/63

And some other messy reports. ISOLINUX must have solved this problem after receiving user reports, so we also need to solve the same problem in our way.

I need more debugging results. These debuggings are more convenient with DOS debug. You can now enter GRUB and also find the (cd) device. This is a great hope.

Well, in such a state, you enter DOS (you can use map to simulate booting a DOS floppy disk), and use debug in DOS to test several functions of int 13 related to cdrom. Details are as follows:

First test. Test whether the int 13/41 function is normal.

Type debug and press Enter under DOS.
Under the debug prompt,
Type a and press Enter to start assembly
Type mov ax,4100 and press Enter
Type mov bx,55AA and press Enter
Type mov DL,9F and press Enter
Type int 13 and press Enter
Type int 3 and press Enter
Press Enter one more time here to end the assembly.
Type g and press Enter to start running the program.
Type q and press Enter to return to the DOS prompt.
Paste the screen display result here.

Second test. Test whether the int 13/4B01 function is normal.

Type debug and press Enter under DOS.
Under the debug prompt,
Type a and press Enter to start assembly
Type mov ax,4B01 and press Enter
Type mov si,0180 and press Enter
Type mov DL,9F and press Enter
Type int 13 and press Enter
Type int 3 and press Enter
Press Enter one more time here to end the assembly.
Type g and press Enter to start running the program.
Type d 0180 and press Enter to display the returned data structure.
Type q and press Enter to return to the DOS prompt.
Paste the screen display result here.

Third test. Test whether the int 13/4800 function is normal.

Type debug and press Enter under DOS.
Under the debug prompt,
Type a and press Enter to start assembly
Type mov ax,4800 and press Enter
Type mov si,0180 and press Enter
Type mov DL,9F and press Enter
Type int 13 and press Enter
Type int 3 and press Enter
Press Enter one more time here to end the assembly.
Type g and press Enter to start running the program.
Type d 0180 and press Enter to display the returned data structure.
Type q and press Enter to return to the DOS prompt.
Paste the screen display result here.

Test 1

-a



1C76:0100 mov ax,4100



1C76:0103 mov bx,55aa



1C76:0106 mov dl,9f



1C76:0108 int 13



1C76:010A int 3



1C76:010B 



-g





AX=0100  BX=55AA  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0000  DI=0000  

DS=1C76  ES=1C76  SS=1C76  CS=1C76  IP=010A   NV UP EI NG NZ AC PO CY 

1C76:010A CC            INT	3                                  

-q

Test 2

-a



1C76:0100 mov ax,4b01



1C76:0103 mov si,0180



1C76:0106 mov dl,9f



1C76:0108 int 13



1C76:010A int 3



1C76:010B 



-g





AX=0101  BX=0000  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C76  ES=1C76  SS=1C76  CS=1C76  IP=010A   NV UP EI NG NZ AC PO CY 

1C76:010A CC            INT	3                                  

-d 0180



1C76:0180  36 90 DE 89 37 03 36 68-DB 2B F7 89 77 03 8B 36   6...7.6h.+..w..6

1C76:0190  96 DE 89 77 09 8B F7 8B-3E 90 DE 03 F9 3B 3E 8C   ...w....>....;>.

1C76:01A0  DE 7D 15 2B F9 FC F3 A4-B0 00 AA 89 3E 90 DE 9D   .}.+........>...

1C76:01B0  F8 EB 0A B8 01 00 EB 03-B8 02 00 9D F9 5E 5F 5A   .............^_Z

1C76:01C0  59 5B C3 50 53 51 57 9C-F6 C7 01 74 27 83 3E 94   Y









Test 3





-a



1C76:0100 mov ax,4800



1C76:0103 mov si,0180



1C76:0106 mov dl,9f



1C76:0108 int 13



1C76:010A int 3



1C76:010B 



-g





AX=0100  BX=0000  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C76  ES=1C76  SS=1C76  CS=1C76  IP=010A   NV UP EI NG NZ AC PO CY 

1C76:010A CC            INT	3                                  

-d 0180



1C76:0180  36 90 DE 89 37 03 36 68-DB 2B F7 89 77 03 8B 36   6...7.6h.+..w..6

1C76:0190  96 DE 89 77 09 8B F7 8B-3E 90 DE 03 F9 3B 3E 8C   ...w....>....;>.

1C76:01A0  DE 7D 15 2B F9 FC F3 A4-B0 00 AA 89 3E 90 DE 9D   .}.+........>...

1C76:01B0  F8 EB 0A B8 01 00 EB 03-B8 02 00 9D F9 5E 5F 5A   .............^_Z

1C76:01C0  59 5B C3 50 53 51 57 9C-F6 C7 01 74 27 83 3E 94   Y

Actually all failed! Do another test:

Fourth test. Test whether the int 13/4200 (sector extended read) function is normal.

Type debug and press Enter under DOS.
Under the debug prompt,
Type a and press Enter to start assembly
Type mov ax,4200 and press Enter
Type mov si,0180 and press Enter
Type mov word ptr [si], 0010 and press Enter
Type mov word ptr [si+2], 0001 and press Enter
Type mov word ptr [si+4], 0200 and press Enter
Type mov word ptr [si+6], cs and press Enter
Type mov word ptr [si+8], 0010 and press Enter
Type mov word ptr [si+A], 0000 and press Enter
Type mov word ptr [si+C], 0000 and press Enter
Type mov word ptr [si+E], 0000 and press Enter
Type mov DL,9F and press Enter
Type int 13 and press Enter
Type int 3 and press Enter
Type an extra Enter here to end the assembly.
Type g and press Enter to start running the program.
Type d 0200 and press Enter to display the returned data structure.
Type q and press Enter to return to the DOS prompt.
Paste the screen display result here.

Test 4

-a



1C76:0100 mov ax,4200



1C76:0103 mov si,0180



1C76:0106 mov word ptr , 0010



1C76:010A mov word ptr , 0001



1C76:010F mov word ptr , 0200



1C76:0114 mov word ptr , cs



1C76:0117 mov word ptr , 0010



1C76:011C mov word ptr , 0000



1C76:0121 mov word ptr , 0000



1C76:0126 mov word ptr , 0000



1C76:012B mov DL,9F



1C76:012D int 13



1C76:012F int 3



1C76:0130 



-g





AX=0100  BX=0000  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C76  ES=1C76  SS=1C76  CS=1C76  IP=012F   NV UP EI NG NZ AC PO CY 

1C76:012F CC            INT	3                                  

-d 0200



1C76:0200  C3 50 8A C3 B3 0B F6 E3-5B 03 C3 93 C3 8B 1E 8E   .P......

Why did it fail again? Could it be that 9F is not the drive letter of the CD? There seemed to be the word 9F in your previous post.

I need to think again about how to continue the test. You can also consider whether you can provide other information.

Then do such a test, which is almost the same as the previous "second" test:

Fifth test. Test whether the int 13/4B01 (DL=7F) function is normal.

Type debug and press Enter under DOS.
Under the debug prompt,
Type a and press Enter to start assembly
Type mov ax,4B01 and press Enter
Type mov si,0180 and press Enter
Type mov DL,7F and press Enter <------ Here, 9F is changed to 7F
Type int 13 and press Enter
Type int 3 and press Enter
Type an extra Enter here to end the assembly.
Type g and press Enter to start running the program.
Type d 0180 and press Enter to display the returned data structure.
Type q and press Enter to return to the DOS prompt.
Paste the screen display result here.

No matter the result, report how you entered GRUB. If it is entered from a CD, say the format of the CD and whether it is in no-emulation mode. If it is entered via other software (such as syslinux, etc.) to enter GRUB, also make it clear.

Supplementary:

When starting GRUB, press the Insert key first (you can quickly tap the Insert key multiple times continuously), and you can enter the "step-through" boot mode. Paste the screen information.

[ Last edited by 不点 on 2007-7-11 at 06:20 PM ]

Because when making this CD, GRUB couldn't work normally, so SYSLINUX was used as the bootloader with GRUB as a backup.

It's booted from USB-CDROM with ISOLINUX, then GRUB is loaded via ISOLINUX, and then the map command is used to enter DOS.

CD format? ISO9660

The office is closed, so I can only test it tomorrow.

Just now I found another same motherboard and re-tested and posted the test data..

Postscript: Just now I tried the one that can be used and found here
get_cdinfo(7f),int13/4B01(7F),err=0,drive=7f, cdrom_drive==9F.
Seems to have some problems. On the computer that can be used, the values of 7f and 9f in this line are the same (EF)

Turning on gate A20 ... Success.

hard drives: 2, int13:F009870,INT15: F00F859

get_diskinfo(80), int13/41(80),version=AA300005, int13/48(80), err=0,C/H/S=16383/16/63,

Sector Count/Size=156301488/0, int13/08(80),version=0, C/H/S=1023/255/63, int13/02(80),

err=0,LBA,C/H/S=16383/255/63,Sector count/size=263192895/512



get_diskinfo(81), int13/41(81),version=AA210005, int13/48(81),err=0,c/h/s=863/16/63,

Sector count/size=1902591/0, int13/08(81),version=0,c/h/s=863/16/63,int13/02(81),err=0,



warning: unrecognized partition table for drive 81, please rebuild it using a microsoft-compatible Fdisk tool

(err=28),current C/H/S=863/16/63 LBA,C/H/S=863/16/63,sector count/size=1902591/512



boot drive=80, int13/4B01(80),err=1,drive=80 not cd

get_cdinfo(7f),int13/4B01(7F),err=0,drive=7f, cdrom_drive==9F.

starting cmain() ... open /default ... int13/41(80),version=AA300005, INT13/48(80),err=0,C/H/S=16383/16/63,

sector count/size=156301488/0, int13/08(80),version=0,C/H/S=1023/255/63, int13/02(80), err=0,failure,



int13/41(9F),version=0,int13/4b01(9f),err=0,drive=9f,biosdisk_int13_extensions read=0,drive=0x9f,dap=580,err=0x1



biosdisk_int13_extensions read=0,drive=0x9f,dap=580,err=0x1

biosdisk_int13_extensions read=0,drive=0x9f,dap=580,err=0x1

....

Note: There is probably a screen full of the above statements.



End of menu init commands,Press any key to enter command-line or run menu ...

Press a key to enter the GRUB command line.

>debug on

>root (cd)

int13/41(9F),version=0,int13/4B01(9F),err=1,drive=9F,int13/48(9f),err=1,c/H/S=0/0/0,sector count/size=0/0,

int13/08(9f),version=1,C/H/S=16383/255/63,

ERROR 26:Selected disk does not exist

>geometry (cd)

int13/41(9f),version=0, int13/4B01(9f),err=1,drive=9F, int13/48(9F),err=1,c/H/S=0/0/0,sector count/size=0/0,

int13/08(9f),version=1,C/H/S=863/16/63,

-a



1C69:0100 mov ax,4100



1C69:0103 mov bx,55aa



1C69:0106 mov dl,9f



1C69:0108 int 13



1C69:010A int 3



1C69:010B 



-g





AX=0100  BX=55AA  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0000  DI=0000  

DS=1C69  ES=1C69  SS=1C69  CS=1C69  IP=010A   NV UP EI NG NZ AC PO CY 

1C69:010A CC            INT	3                                  

-q

-a



1C69:0100 mov ax,4b01



1C69:0103 mov si,0180



1C69:0106 mov dl,9f



1C69:0108 int 13



1C69:010A int 3



1C69:010B 



-g





AX=0101  BX=0000  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C69  ES=1C69  SS=1C69  CS=1C69  IP=010A   NV UP EI NG NZ AC PO CY 

1C69:010A CC            INT	3                                  

-d 0180



1C69:0180  36 90 DE 89 37 03 36 68-DB 2B F7 89 77 03 8B 36   6...7.6h.+..w..6

1C69:0190  96 DE 89 77 09 8B F7 8B-3E 90 DE 03 F9 3B 3E 8C   ...w....>....;>.

1C69:01A0  DE 7D 15 2B F9 FC F3 A4-B0 00 AA 89 3E 90 DE 9D   .}.+........>...

1C69:01B0  F8 EB 0A B8 01 00 EB 03-B8 02 00 9D F9 5E 5F 5A   .............^_Z

1C69:01C0  59 5B C3 50 53 51 57 9C-F6 C7 01 74 27 83 3E 94   Y













-a



1C69:0100 mov ax,4800



1C69:0103 mov si,0180



1C69:0106 mov dl,9f



1C69:0108 int 13



1C69:010A int 3



1C69:010B 



-g





AX=0100  BX=0000  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C69  ES=1C69  SS=1C69  CS=1C69  IP=010A   NV UP EI NG NZ AC PO CY 

1C69:010A CC            INT	3                                  

-d 0180



1C69:0180  36 90 DE 89 37 03 36 68-DB 2B F7 89 77 03 8B 36   6...7.6h.+..w..6

1C69:0190  96 DE 89 77 09 8B F7 8B-3E 90 DE 03 F9 3B 3E 8C   ...w....>....;>.

1C69:01A0  DE 7D 15 2B F9 FC F3 A4-B0 00 AA 89 3E 90 DE 9D   .}.+........>...

1C69:01B0  F8 EB 0A B8 01 00 EB 03-B8 02 00 9D F9 5E 5F 5A   .............^_Z

1C69:01C0  59 5B C3 50 53 51 57 9C-F6 C7 01 74 27 83 3E 94   Y











-a



1C69:0100 mov ax,4200



1C69:0103 mov si,0180



1C69:0106 mov word ptr , 0010



1C69:010A mov word ptr , 0001



1C69:010F mov word ptr , 0200



1C69:0114 mov word ptr , cs



1C69:0117 mov word ptr , 0010



1C69:011C mov word ptr , 0000



1C69:0121 mov word ptr , 0000



1C69:0126 mov word ptr , 0000



1C69:012B mov DL,9F



1C69:012D int 13



1C69:012F int 3



1C69:0130 



-g





AX=0100  BX=0000  CX=0000  DX=009F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C69  ES=1C69  SS=1C69  CS=1C69  IP=012F   NV UP EI NG NZ AC PO CY 

1C69:012F CC            INT	3                                  

-d 0200



1C69:0200  C3 50 8A C3 B3 0B F6 E3-5B 03 C3 93 C3 8B 1E 8E   .P......















-a



1C69:0100 mov ax,4b01



1C69:0103 mov si,0180



1C69:0106 mov dl,7f



1C69:0108 int 13



1C69:010A int 3



1C69:010B 



-g





AX=8001  BX=0000  CX=0000  DX=007F  SP=FFEE  BP=0000  SI=0180  DI=0000  

DS=1C69  ES=1C69  SS=1C69  CS=1C69  IP=010A   OV UP EI PL NZ AC PO CY 

1C69:010A CC            INT	3                                  

-d 0180



1C69:0180  10 00 01 00 00 02 69 1C-10 00 00 00 00 00 00 00   ......i.........

1C69:0190  96 DE 89 77 09 8B F7 8B-3E 90 DE 03 F9 3B 3E 8C   ...w....>....;>.

1C69:01A0  DE 7D 15 2B F9 FC F3 A4-B0 00 AA 89 3E 90 DE 9D   .}.+........>...

1C69:01B0  F8 EB 0A B8 01 00 EB 03-B8 02 00 9D F9 5E 5F 5A   .............^_Z

1C69:01C0  59 5B C3 50 53 51 57 9C-F6 C7 01 74 27 83 3E 94   Y









[ Last edited by chenall on 2007-7-11 at 08:53 PM ]