acer extensa 5630, btx loader panics (cd boot)

[Ilya Zhuravlev]

big sorry for noise, checksums for writed and downloaded image are not 
the same

> I'm trying to install 8.0-beta2 amd64 on this hardware:
> core 2 duo T5800, 2GB, chipset mobile GM45 express, 160gb sata, wifi 
> Atheros AR5007EG
> vendor partnumber EX5630-582G16Mi
>
> error:
>
> BTX loader 1.00 BTX version is 1.02
> Consoles: internal video/keyboard
> panic: free: guard1 fail @0x7b397074 from 
> /usr/src/sys/boot/loader/../../common/console.c:94
> -->Press a key on the console for reboot<--
>
> In bios I can change only "load default setting" and ATA-mode 
> (AHCI/IDE) options, and applying any of them doesn't make any sense.
> Googling doesn't get results for related errors.
> It seems that console.c was not changed for the last 3 years, 7-releng 
> was skipped and I've tried to boot with 6.0-release i386 (btx loader 
> 1.01) - succesfull.
> What can I do?