Hi all,
As talked with Aleksey i would want to let you knwo that revision r41685 is broken, in my real hardware, at least.
This is the log i get, im sorry to say i cannot give you more details (backtraces, disasm´s, and so, since even kb does not work after the crash.

(ntoskrnl/kd/kdio.c:221) ReactOS 0.4-SVN (Build 20090629-r41685)
(ntoskrnl/kd/kdio.c:222) Command Line: NOGUIBOOT DEBUGPORT=COM1 NOGUIBOOT DEBUGPORT=COM1
(ntoskrnl/kd/kdio.c:223) ARC Paths: multi(0)disk(0)cdrom(159) \ multi(0)disk(0)cdrom(159) \reactos\
Used memory 327284Kb
(ntoskrnl/mm/mminit.c:224)    Start         End         Type
(ntoskrnl/mm/mminit.c:225) 0x80000000 - 0x80800000      Undefined region
(ntoskrnl/mm/mminit.c:228) 0x80800000 - 0x80E00000      FreeLDR Kernel mapping region
(ntoskrnl/mm/mminit.c:231) 0x80E00000 - 0x80FE0000      PFN Database region
(ntoskrnl/mm/mminit.c:238) 0x80FE0000 - 0x873E0000      Non paged pool region
(ntoskrnl/mm/mminit.c:241) 0x873E0000 - 0x8D7E0000      Paged pool region
(ARMÂ³::INIT:340) System PTE count has been tuned to 22000 (90112000 bytes)
(ARMÂ³::INIT:445) NP Pool has been tuned to: 10584064 bytes and 130072576 bytes
(ARMÂ³::INIT:490) System PTE VA starts at: F3000000
(ARMÂ³::INIT:491) NP Expansion VA begins at: F89EC000 and ends at: FFBE0000
(ARMÂ³::INIT:507) PFN DB VA begins at: B0000000 and ends at: B01E0000
(ARMÂ³::INIT:510) PFN DB PA PFN begins at: 1000
(ARMÂ³::INIT:511) NP VA begins at: B01E0000 and ends at: B0BF8000
(ARMÂ³::INIT:514) NP PA PFN begins at: 11e0
(ARMÂ³::SYSPTE:341) System PTE space for 1 starting at: C03E27B4 and ending at: C03FEF78
Assertion '(MmNumberOfSystemPtes - OldCount) <= 1000' failed at ARMÂ³::INIT line 652
Entered debugger on embedded INT3 at 0x0008:0x808bfcf6.
kdb:>