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Subjectnommu_map_sg: overflow with ata_piix?
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I just got a new dual Xeon system with 4 GB of RAM and SATA drives.
It boots fine with Debian's 2.6.15 kernel, but I just tried building a
kernel from an up-to-date Linus tree, and I get the following on boot:

scsi0 : ata_piix
ATA: abnormal status 0x7F on port 0x405F
scsi1 : ata_piix
Vendor: ATA Model: Maxtor 6L080M0 Rev: BACE
Type: Direct-Access ANSI SCSI revision: 05
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
SCSI device sda: drive cache: write through
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
SCSI device sda: drive cache: write through
sda:<3>nommu_map_sg: overflow 11b8a9000+4096 of device mask ffffffff
nommu_map_sg: overflow 11b8a9000+4096 of device mask ffffffff
nommu_map_sg: overflow 11b8a9000+4096 of device mask ffffffff
nommu_map_sg: overflow 11b8a9000+4096 of device mask ffffffff
nommu_map_sg: overflow 11b8a9000+4096 of device mask ffffffff
nommu_map_sg: overflow 11b8a9000+4096 of device mask ffffffff
sd 0:0:0:0: SCSI error: return code = 0x70000

and then of course it panics because it can't find the root partition.

Some RAM is being remapped above 4 GB:

BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000dfff3000 (usable)
BIOS-e820: 00000000dfff3000 - 00000000dfffb000 (ACPI data)
BIOS-e820: 00000000dfffb000 - 00000000e0000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fed00000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 000000011bfff000 (usable)

Any suggestions? I can provide more debugging info if required.

Thanks,
Roland
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