Latest builds of GRUB4DOS unbootable on Pentium MMX boards.

[skrzyp]

GRUB4DOS stays at blinking cursor right after the MBR finds /grldr on one of supported partitions (in this case, 4/8GB FAT32).

The real machine tested is Toshiba Libretto 100CT, as well as QEMU (i386, with cmdline `qemu-system-i386 -cpu pentium -hda /dev/sdb -m 32). Both cases fail to load.

However, when I try with CPU pentium2 in QEMU, everything loads properly with the same image

Tested build: grub4dos-0.4.6a-2018-04-23.7z Installation method:

# ./bootlace64.com  --no-backup-mbr --mbr-disable-floppy --mbr-disable-osbr /dev/sdb
Disk geometry calculated according to the partition table:

        Sectors per track = 63, Number of heads = 255
Success.
# mount /dev/sdb1 /mnt # FAT32 partition with MS-DOS and Windows 98 SE
# cp (…)/grldr /mnt/grldr
# umount /mnt/ && sync

[yaya2007]

From which version of the problem? Please report.

It may be that the grldr file is too late.

[steve6375]

He says 2018-04-23??

[yaya2007]

I mean, the line between a good version and a bad version.

[steve6375]

I tested using QEMU 32-bit x86 emulator under Windows and Easy2Boot USB flash drive using recent 0.4.6a and 0.4.5c 2015-05-18.

pentium - FAIL pentium2 FAIL pentium3 PASS

Easy2Boot ran menu.lst and processed all commands OK, but froze at point where menu should be displayed (configfile command).

A simple menu.lst displays the menu and works OK e.g. title test boot

I also tried E2B with 0.4.6a 2013-03-20 and that also hangs just when about to display the E2B menu. P2 was made in 1997, P3 was made in 1999. Not many 18 year old systems around now...

[yaya2007]

see. Use 486 or 586 instructions, old CPU is not suitable. Old motherboard, use the early grub4dos bar