While looking at the stats for this site, I noticed that plenty of people seems to be searching for information on running FreeBSD on the Dell PowerEdge R300. All I can tell you is that since FreeBSD 7.1 it works just fine, without modification, using the GENERIC kernel.

Below is the dmesg from FreeBSD 7.2 (amd64). This is for a standard R300, with no additional options other than a second hard drive. It also has a USB memory stick connected to the internal USB port, so that the server can still be booted even if both hard drives fail (theoretically - not tested).

Copyright (c) 1992-2009 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 7.2-RELEASE-p1 #5: Tue Jun 16 21:42:57 BST 2009
    
  This e-mail address is being protected from spambots. You need JavaScript enabled to view it
 :/usr/obj/usr/src/sys/GENERIC
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU           X3323  @ 2.50GHz (2500.01-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x10676  Stepping = 6
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0xce3bd<SSE3,RSVD2,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,<b19>>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  Cores per package: 4
usable memory = 2128711680 (2030 MB)
avail memory  = 2052505600 (1957 MB)
ACPI APIC Table: <DELL   PE_SC3  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
ioapic0: Changing APIC ID to 4
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <DELL PE_SC3> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
Timecounter "ACPI-safe" frequency 3579545 Hz quality 850
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 900
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <PCI-PCI bridge> at device 2.0 on pci0
pci3: <PCI bus> on pcib1
pcib2: <PCI-PCI bridge> at device 3.0 on pci0
pci4: <PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> at device 4.0 on pci0
pci5: <ACPI PCI bus> on pcib3
pcib4: <PCI-PCI bridge> at device 5.0 on pci0
pci6: <PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 6.0 on pci0
pci7: <ACPI PCI bus> on pcib5
pcib6: <ACPI PCI-PCI bridge> at device 7.0 on pci0
pci8: <ACPI PCI bus> on pcib6
pci0: <base peripheral> at device 8.0 (no driver attached)
pcib7: <PCI-PCI bridge> irq 16 at device 28.0 on pci0
pci9: <PCI bus> on pcib7
pcib8: <ACPI PCI-PCI bridge> irq 16 at device 28.4 on pci0
pci1: <ACPI PCI bus> on pcib8
pci0:1:0:0: failed to read VPD data.
bge0: <Broadcom BCM5722 A0, ASIC rev. 0xa200> mem 0xdfdf0000-0xdfdfffff irq 16 at device 0.0 on pci1
miibus0: <MII bus> on bge0
brgphy0: <BCM5722 10/100/1000baseTX PHY> PHY 1 on miibus0
brgphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
bge0: Ethernet address: 00:1e:4f:33:d6:d0
bge0: [ITHREAD]
pcib9: <ACPI PCI-PCI bridge> irq 17 at device 28.5 on pci0
pci2: <ACPI PCI bus> on pcib9
bge1: <Broadcom NetXtreme Gigabit Ethernet Controller, ASIC rev. 0xa200> mem 0xdfef0000-0xdfefffff irq 17 at device 0.0 on pci2
miibus1: <MII bus> on bge1
brgphy1: <BCM5722 10/100/1000baseTX PHY> PHY 1 on miibus1
brgphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
bge1: Ethernet address: 00:1e:4f:33:d6:d1
bge1: [ITHREAD]
uhci0: <UHCI (generic) USB controller> port 0xdc80-0xdc9f irq 21 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
uhci0: [ITHREAD]
usb0: <UHCI (generic) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
uhci1: <UHCI (generic) USB controller> port 0xdca0-0xdcbf irq 20 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
uhci1: [ITHREAD]
usb1: <UHCI (generic) USB controller> on uhci1
usb1: USB revision 1.0
uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 2 ports with 2 removable, self powered
uhci2: <UHCI (generic) USB controller> port 0xdcc0-0xdcdf irq 21 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
uhci2: [ITHREAD]
usb2: <UHCI (generic) USB controller> on uhci2
usb2: USB revision 1.0
uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
uhub2: 2 ports with 2 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xdfcffc00-0xdfcfffff irq 21 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb3: EHCI version 1.0
usb3: companion controllers, 2 ports each: usb0 usb1 usb2
usb3: <EHCI (generic) USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3
uhub3: 6 ports with 6 removable, self powered
umass0: <LEXAR MEDIA JUMPDRIVE SPORT, class 0/0, rev 2.00/30.00, addr 2> on uhub3
uhub4: <vendor 0x04b4 product 0x6560, class 9/0, rev 2.00/90.15, addr 3> on uhub3
uhub4: single transaction translator
uhub4: 2 ports with 2 removable, self powered
pcib10: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci10: <ACPI PCI bus> on pcib10
vgapci0: <VGA-compatible display> port 0xec00-0xecff mem 0xd0000000-0xd7ffffff,0xdfff0000-0xdfffffff irq 19 at device 7.0 on pci10
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH9 SATA300 controller> port 0xdc20-0xdc27,0xdc10-0xdc13,0xdc28-0xdc2f,0xdc14-0xdc17,0xdc40-0xdc4f,0xdc50-0xdc5f irq 23 at device 31.2 on pci0
atapci0: [ITHREAD]
ata2: <ATA channel 0> on atapci0
ata2: [ITHREAD]
ata3: <ATA channel 1> on atapci0
ata3: [ITHREAD]
atapci1: <Intel ICH9 SATA300 controller> port 0xdc30-0xdc37,0xdc18-0xdc1b,0xdc38-0xdc3f,0xdc1c-0xdc1f,0xdc60-0xdc6f,0xdc70-0xdc7f irq 22 at device 31.5 on pci0
atapci1: [ITHREAD]
ata4: <ATA channel 0> on atapci1
ata4: [ITHREAD]
ata5: <ATA channel 1> on atapci1
ata5: [ITHREAD]
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: does not respond
device_attach: fdc0 attach returned 6
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio0: [FILTER]
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
sio1: [FILTER]
cpu0: <ACPI CPU> on acpi0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
p4tcc1: <CPU Frequency Thermal Control> on cpu1
cpu2: <ACPI CPU> on acpi0
est2: <Enhanced SpeedStep Frequency Control> on cpu2
p4tcc2: <CPU Frequency Thermal Control> on cpu2
cpu3: <ACPI CPU> on acpi0
est3: <Enhanced SpeedStep Frequency Control> on cpu3
p4tcc3: <CPU Frequency Thermal Control> on cpu3
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: does not respond
device_attach: fdc0 attach returned 6
orm0: <ISA Option ROMs> at iomem 0xc0000-0xc8fff,0xc9000-0xc9fff,0xec000-0xeffff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
ppc0: cannot reserve I/O port range
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 1.000 msec
ad4: 152587MB <WDC WD1601ABYS-18C0A0 06.06H05> at ata2-master SATA300
acd0: DVDROM <TEAC DVD-ROM DV28SV/D.0E> at ata2-slave SATA150
ad6: 152587MB <WDC WD1601ABYS-18C0A0 06.06H05> at ata3-master SATA300
GEOM_MIRROR: Device mirror/gm0 launched (2/2).
GEOM_LABEL: Label for provider mirror/gm0s1 is msdosfs/DellUtility.
GEOM_LABEL: Label for provider mirror/gm0s2 is msdosfs/OS.
GEOM_LABEL: Label for provider mirror/gm0s3a is ufsid/481ca24bb929589f.
GEOM_LABEL: Label for provider mirror/gm0s3d is ufsid/481ca2504609c3b4.
GEOM_LABEL: Label for provider mirror/gm0s3e is ufsid/481ca24b7ec903d6.
GEOM_LABEL: Label for provider mirror/gm0s3f is ufsid/481ca24bcf21dd1b.
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <LEXAR JUMPDRIVE SPORT 1000> Removable Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: 495MB (1014784 512 byte sectors: 64H 32S/T 495C)
GEOM_LABEL: Label for provider da0s1a is ufsid/4828bbc089fb6d4e.
Trying to mount root from ufs:/dev/mirror/gm0s3a
GEOM_LABEL: Label ufsid/481ca24bb929589f removed.
GEOM_LABEL: Label for provider mirror/gm0s3a is ufsid/481ca24bb929589f.
GEOM_LABEL: Label ufsid/481ca24b7ec903d6 removed.
GEOM_LABEL: Label for provider mirror/gm0s3e is ufsid/481ca24b7ec903d6.
GEOM_LABEL: Label ufsid/481ca24bcf21dd1b removed.
GEOM_LABEL: Label for provider mirror/gm0s3f is ufsid/481ca24bcf21dd1b.
GEOM_LABEL: Label ufsid/481ca2504609c3b4 removed.
GEOM_LABEL: Label for provider mirror/gm0s3d is ufsid/481ca2504609c3b4.
GEOM_LABEL: Label ufsid/481ca24bb929589f removed.
GEOM_LABEL: Label ufsid/481ca24b7ec903d6 removed.
GEOM_LABEL: Label ufsid/481ca24bcf21dd1b removed.
GEOM_LABEL: Label ufsid/481ca2504609c3b4 removed.
bge0: link state changed to UP