I think I might have a new datapoint to add to this discussion: I've got a IBM Thinkpad T42 with 1 GB RAM. Never had any problems with PCMCIA, but that's probably just because another PCI device has been mapped into the hole in the BIOS memory map:
[EMAIL PROTECTED]:~$ grep e820 /var/log/dmesg BIOS-e820: 0000000000000000 - 000000000009f000 (usable) BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved) BIOS-e820: 00000000000d2000 - 00000000000d4000 (reserved) BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000003ff50000 (usable) BIOS-e820: 000000003ff50000 - 000000003ff67000 (ACPI data) BIOS-e820: 000000003ff67000 - 000000003ff79000 (ACPI NVS) BIOS-e820: 000000003ff80000 - 0000000040000000 (reserved) BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved) [EMAIL PROTECTED]:~$ cat /proc/iomem 00000000-0009efff : System RAM 0009f000-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000cffff : Video ROM 000d0000-000d0fff : Adapter ROM 000d1000-000d1fff : Adapter ROM 000d2000-000d3fff : reserved 000e0000-000effff : Extension ROM 000f0000-000fffff : System ROM 00100000-3ff4ffff : System RAM 00100000-002d4013 : Kernel code 002d4014-00399f3f : Kernel data 3ff50000-3ff66fff : ACPI Tables 3ff67000-3ff78fff : ACPI Non-volatile Storage 3ff79000-3ff793ff : 0000:00:1f.1 3ff80000-3fffffff : reserved 40000000-403fffff : PCI CardBus #03 40400000-407fffff : PCI CardBus #03 40800000-40bfffff : PCI CardBus #07 40c00000-40ffffff : PCI CardBus #07 b0000000-b0000fff : 0000:02:00.0 b0000000-b0000fff : yenta_socket b1000000-b1000fff : 0000:02:00.1 b1000000-b1000fff : yenta_socket c0000000-c00003ff : 0000:00:1d.7 c0000000-c00003ff : ehci_hcd c0000800-c00008ff : 0000:00:1f.5 c0000800-c00008ff : Intel 82801DB-ICH4 c0000c00-c0000dff : 0000:00:1f.5 c0000c00-c0000dff : Intel 82801DB-ICH4 c0100000-c01fffff : PCI Bus #01 c0100000-c010ffff : 0000:01:00.0 c0100000-c010ffff : radeonfb c0200000-c020ffff : 0000:02:01.0 c0200000-c020ffff : e1000 c0210000-c021ffff : 0000:02:02.0 c0210000-c021ffff : ath c0220000-c023ffff : 0000:02:01.0 c0220000-c023ffff : e1000 d0000000-dfffffff : 0000:00:00.0 e0000000-e7ffffff : PCI Bus #01 e0000000-e7ffffff : 0000:01:00.0 e0000000-e7ffffff : radeonfb ff800000-ffffffff : reserved [EMAIL PROTECTED]:~$ lspci -vv -s 0:1f.1 0000:00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4) Ultra ATA Storage Controller (rev 01) (prog-if 8a [Master SecP PriP]) Subsystem: IBM: Unknown device 052d Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Interrupt: pin A routed to IRQ 11 Region 0: I/O ports at <unassigned> Region 1: I/O ports at <unassigned> Region 2: I/O ports at <unassigned> Region 3: I/O ports at <unassigned> Region 4: I/O ports at 1860 [size=16] Region 5: Memory at 3ff79000 (32-bit, non-prefetchable) [size=1K] Bjørn -- You have the lack of intelligence of a sadist. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/