hang up when booting the kernel

hang up when booting the kernel hi all, i install two OS fedora core 4 which is kernel 2.6.14 used for target machine and the other is 2.6.11 used for develop machine.

vmare 5.5.3 OS:fedora core 4 develop: kernel 2.6.11 target: kernel 2.6.14 kgdb patch:kgdb-2-2.6.14.tar

 title Fedora Core(2.6.11-1.1369_FC4) 	root (hd0,0) 	kernel /vmlinuz-2.6.11-1.1369_FC4 ro root=/dev/VolGroup00/LogVol00 	initrd /initrd-2.6.11-1.1369_FC4.img title Fedora Core(2.6.14) 	root (hd0,0) 	kernel /vmlinuz-2.6.14 ro root=/dev/VolGroup00/LogVol00 	initrd /initrd-2.6.14.img 
the develop machine and target machine are both boot up successfully, and i make suer the two OS can communication each other by serial(i user ttyS0, Baud_base:115200)

but when i modify grub.conf into , the target machine will hang up at

UncoMpressing Linux... OK,boot the kernel

 title Fedora Core(2.6.11-1.1369_FC4) 	root (hd0,0) 	kernel /vmlinuz-2.6.11-1.1369_FC4 ro root=/dev/VolGroup00/LogVol00 	initrd /initrd-2.6.11-1.1369_FC4.img title Fedora Core(2.6.14) 	root (hd0,0) 	kernel /vmlinuz-2.6.14 ro root=/dev/VolGroup00/LogVol00 kgdbwait  kgdb8250=0,115200 	initrd /initrd-2.6.14.img 

is there anyone met the problem befor? please give me an advice , thanks

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freegnu
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