It seems wifi does not work with multiboot.

Following errors are written by dmesg (I've tried 2.6.38-1000-ac100 and 3.0.8-4-ac100 kernels from Ubuntu):
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Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.080084] tegra-ehci tegra-ehci.2: USB 2.0 started, EHCI 1.00
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.367615] irq 129: nobody cared (try booting with the "irqpoll" option)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.367807] Backtrace:
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.367900] [<c0042e60>] (unwind_backtrace+0x0/0xe0) from [<c0407444>] (__report_bad_irq+0x34/0x8c)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.368162] [<c0407444>] (__report_bad_irq+0x34/0x8c) from [<c00b7640>] (note_interrupt+0x148/0x1d8)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.368418] [<c00b7640>] (note_interrupt+0x148/0x1d8) from [<c00b7c64>] (handle_level_irq+0xfc/0x160)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.368678] [<c00b7c64>] (handle_level_irq+0xfc/0x160) from [<c0036088>] (asm_do_IRQ+0x88/0xc8)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.368924] [<c0036088>] (asm_do_IRQ+0x88/0xc8) from [<c04149ec>] (__irq_svc+0x4c/0xe4)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.369143] Exception stack(0xdb843df8 to 0xdb843e40)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.369286] 3de0:                                                       00000000 00000000
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.369516] 3e00: 00000000 c0609dc0 db842000 00000000 00000282 00000001 00000000 db842000
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.369746] 3e20: 00000000 0000000a 0000000c db843e40 c0076ee4 c0076ef8 20000113 ffffffff
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.374697] [<c04149ec>] (__irq_svc+0x4c/0xe4) from [<c0076ef8>] (__do_softirq+0x50/0x250)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.379666] [<c0076ef8>] (__do_softirq+0x50/0x250) from [<c0077530>] (irq_exit+0x48/0xa0)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.384640] [<c0077530>] (irq_exit+0x48/0xa0) from [<c0036290>] (do_local_timer+0x58/0x84)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.389630] [<c0036290>] (do_local_timer+0x58/0x84) from [<c04149ec>] (__irq_svc+0x4c/0xe4)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.394712] Exception stack(0xdb843e90 to 0xdb843ed8)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.399758] 3e80:                                     db2c4400 00000000 db2c4800 00000268
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.404914] 3ea0: db2c4400 00000081 00000080 00000000 db2c44b0 00000002 00000000 00000000
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.410097] 3ec0: 00002ebc db843ed8 c02cc470 c02cb28c 80000013 ffffffff
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.404914] 3ea0: db2c4400 00000081 00000080 00000000 db2c44b0 00000002 00000000 00000000
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.410097] 3ec0: 00002ebc db843ed8 c02cc470 c02cb28c 80000013 ffffffff
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.415343] [<c04149ec>] (__irq_svc+0x4c/0xe4) from [<c02cb28c>] (register_root_hub+0x0/0x118)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.420733] [<c02cb28c>] (register_root_hub+0x0/0x118) from [<c05b0be8>] (0xc05b0be8)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.426124] handlers:
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.431394] [<c02cb3a4>] (usb_hcd_irq+0x0/0x6c)
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.436787] Disabling IRQ #129
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.442725] tegra-ehci tegra-ehci.2: USB bus 2 deregistered
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.442740] tegra-ehci tegra-ehci.2: Failed to add USB HCD
Feb 11 19:35:07 eyusupov-ac100 kernel: [    2.448087] tegra-ehci: probe of tegra-ehci.2 failed with error -108
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After removing multiboot wifi works fine again.