5.3-BETA2 and BETA3 boot problem

Hi, 

I could not find my solution in the list archieves. I could not decide which 
list to post. I am directed this list after I post to stable, so here it 
goes. 

I can not boot with very recent sources. 

I have FreeBSD 5.3-BETA2 #0: Tue Aug 31 22:36:53 EEST 2004 sources with 
cvsup. This kernel locks during boot, before mounting disks, and most 
probably during identification of disks. 

BETA1 was locked previously, too. By "lock" I mean first main console 
freeze, after several seconds keybord lights freeze. Keyboard does not work. 
Screen stays same. Only reset from case or re-cycling the power helps. There 
is no core dump or log. Below is the output of the screen of a verbose boot: 

After initializin "lo0" there is two times below paragraph and system locks:
 ---
ata0: reinit channel ..
ata0: reset tp1 mask=03 ostat=50 ostat1=50
ata0-master: stat=0x50 err=0x01 lsb=0x00 msb=0x00
ata0-slave: stat=0x10 err=0x01 lsb=0x14 msb=0xeb
ata0: reset tp2 stat0=50 stat1=10 devices=0x9<ATAPI_SLAVE,ATA_MASTER>
ata0: resetting done ..
 --- 

I have VIA chipset mainboard with onboard display. Mainboard model is:
P4MAC-MLB or P4MAC-M I am not quite sure about it at the moment. It is an 
AZZA mainboard.  North bridge is VIA P4M266A, Southbridge is VIA VT8235. I/O 
Chipset is Winbond W83697HF. 

I do not have this problem with my old kernel "FreeBSD 5.2-CURRENT #0: Thu 
Jul  1 22:40:57 EEST 2004" with same hardware. 

Yesterday, I tried again with 3 Sept 2004 evening sources. Now, I read 
"BETA3" during boot. Same problem persists. Hope above helps to find the 
problem. 

Regards,
Ertan Kucukoglu