Description of problem:

Testing Fedora on EC2: https://fedoraproject.org/wiki/Test_Day:2011-04-28_Cloud_SIG_Fedora_EC2

AMI ami-ca9f60a3 (64 bit) fails to boot with the following console log:






    Xen Minimal OS!
  start_info: 0x1890000(VA)
    nr_pages: 0x1e0000
  shared_inf: 0xbcd1f000(MA)
     pt_base: 0x1893000(VA)
nr_pt_frames: 0x11
    mfn_list: 0x990000(VA)
   mod_start: 0x0(VA)
     mod_len: 0
       flags: 0x0
    cmd_line: root=/dev/sda1 ro 4
  stack:      0x94f860-0x96f860
MM: Init
      _text: 0x0(VA)
     _etext: 0x5ff6d(VA)
   _erodata: 0x78000(VA)
     _edata: 0x80b00(VA)
stack start: 0x94f860(VA)
       _end: 0x98fe68(VA)
  start_pfn: 18a7
    max_pfn: 1e0000
Mapping memory range 0x1c00000 - 0x1e0000000
setting 0x0-0x78000 readonly
skipped 0x1000
MM: Initialise page allocator for 27a0000(27a0000)-1e0000000(1e0000000)
MM: done
Demand map pfns at 1e0001000-21e0001000.
Heap resides at 21e0002000-41e0002000.
Initialising timer interface
Initialising console ... done.
gnttab_table mapped at 0x1e0001000.
Initialising scheduler
Thread "Idle": pointer: 0x21e0002010, stack: 0x36f0000
Initialising xenbus
Thread "xenstore": pointer: 0x21e00027c0, stack: 0x3700000
Dummy main: start_info=0x96f960
Thread "main": pointer: 0x21e0002f70, stack: 0x3710000
"main" "root=/dev/sda1" "ro" "4" 
vbd 2049 is hd0
******************* BLKFRONT for device/vbd/2049 **********


backend at /local/domain/0/backend/vbd/104/2049
Failed to read /local/domain/0/backend/vbd/104/2049/feature-barrier.
Failed to read /local/domain/0/backend/vbd/104/2049/feature-flush-cache.
20480000 sectors of 512 bytes
**************************
vbd 2064 is hd1
******************* BLKFRONT for device/vbd/2064 **********


backend at /local/domain/0/backend/vbd/104/2064
Failed to read /local/domain/0/backend/vbd/104/2064/feature-barrier.
Failed to read /local/domain/0/backend/vbd/104/2064/feature-flush-cache.
880732160 sectors of 512 bytes
**************************
vbd 2080 is hd2
******************* BLKFRONT for device/vbd/2080 **********


backend at /local/domain/0/backend/vbd/104/2080
Failed to read /local/domain/0/backend/vbd/104/2080/feature-barrier.
Failed to read /local/domain/0/backend/vbd/104/2080/feature-flush-cache.
880732160 sectors of 512 bytes
**************************

    [H
    [J

    GNU GRUB  version 0.97  (7864320K lower / 0K upper memory)



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grubdom>                                                                       
    [9;10H



P.S. I used spin-kickstart component as I didn't know where to place this bug report. Please reassign if you want.