Description of problem:
The Fedora 20 3.16.4-200.fc20.armv7hl fails to boot on Calxeda Highbank systems.

Starting kernel ... 
...
[    0.000000] Linux version 3.16.4-200.fc20.armv7hl (mockbuild.fedoraproject.org) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-7) (GCC) ) #1 SMP Mon Oct 6 14:23:34 UTC 2014 
...
[    0.000000] ------------[ cut here ]------------ 
[    0.000000] WARNING: CPU: 0 PID: 0 at arch/arm/mach-highbank/highbank.c:60 highbank_l2c310_write_sec+0x4c/0x64() 
[    0.000000] Highbank L2C310: ignoring write to reg 0x104 
[    0.000000] Modules linked in: 
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.16.4-200.fc20.armv7hl #1 
[    0.000000] [<c0218310>] (unwind_backtrace) from [<c021270c>] (show_stack+0x18/0x1c) 
[    0.000000] [<c021270c>] (show_stack) from [<c0870e6c>] (dump_stack+0x70/0x8c) 
[    0.000000] [<c0870e6c>] (dump_stack) from [<c0250ae0>] (warn_slowpath_common+0x6c/0x90) 
[    0.000000] [<c0250ae0>] (warn_slowpath_common) from [<c0250b38>] (warn_slowpath_fmt+0x34/0x44) 
[    0.000000] [<c0250b38>] (warn_slowpath_fmt) from [<c022990c>] (highbank_l2c310_write_sec+0x4c/0x64) 
[    0.000000] [<c022990c>] (highbank_l2c310_write_sec) from [<c02230e8>] (l2c_write_sec+0x34/0x44) 
[    0.000000] [<c02230e8>] (l2c_write_sec) from [<c022314c>] (l2c_enable+0x24/0xa4) 
[    0.000000] [<c022314c>] (l2c_enable) from [<c0bcc7f4>] (l2c310_enable+0x188/0x1f0) 
[    0.000000] [<c0bcc7f4>] (l2c310_enable) from [<c0bcc5e8>] (__l2c_init+0x14c/0x1d0) 
[    0.000000] [<c0bcc5e8>] (__l2c_init) from [<c0bccccc>] (l2x0_of_init+0x16c/0x19c) 
[    0.000000] [<c0bccccc>] (l2x0_of_init) from [<c0bc7b58>] (init_IRQ+0x58/0x78) 
[    0.000000] [<c0bc7b58>] (init_IRQ) from [<c0bc5a10>] (start_kernel+0x200/0x3a8) 
[    0.000000] [<c0bc5a10>] (start_kernel) from [<00208074>] (0x208074) 
[    0.000000] ---[ end trace 3406ff24bd97382e ]--- 
...

[    1.370234] VFS: Cannot open root device "UUID=5ac79003-01c6-4685-9ccc-d20d361147bf" or unknown-block(0,0): error -6 
[    1.380762] Please append a correct "root=" boot option; here are the available partitions: 
[    1.389113] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 
[    1.397371] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W     3.16.4-200.fc20.armv7hl #1 
[    1.405814] [<c0218310>] (unwind_backtrace) from [<c021270c>] (show_stack+0x18/0x1c) 
[    1.413555] [<c021270c>] (show_stack) from [<c0870e6c>] (dump_stack+0x70/0x8c) 
[    1.420774] [<c0870e6c>] (dump_stack) from [<c086d8fc>] (panic+0x8c/0x208) 
[    1.427645] [<c086d8fc>] (panic) from [<c0bc6144>] (mount_block_root+0x238/0x274) 
[    1.435125] [<c0bc6144>] (mount_block_root) from [<c0bc630c>] (prepare_namespace+0x128/0x188) 
[    1.443644] [<c0bc630c>] (prepare_namespace) from [<c0bc5db8>] (kernel_init_freeable+0x200/0x24c) 
[    1.452515] [<c0bc5db8>] (kernel_init_freeable) from [<c086bedc>] (kernel_init+0x10/0xec) 
[    1.460689] [<c086bedc>] (kernel_init) from [<c020eb98>] (ret_from_fork+0x14/0x20) 
[    1.468251] CPU1: stopping 
[    1.470952] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W     3.16.4-200.fc20.armv7hl #1 
[    1.479387] [<c0218310>] (unwind_backtrace) from [<c021270c>] (show_stack+0x18/0x1c) 
[    1.487124] [<c021270c>] (show_stack) from [<c0870e6c>] (dump_stack+0x70/0x8c) 
[    1.494340] [<c0870e6c>] (dump_stack) from [<c0215d68>] (handle_IPI+0xd4/0x170) 
[    1.501643] [<c0215d68>] (handle_IPI) from [<c020891c>] (gic_handle_irq+0x68/0x70) 
[    1.509210] [<c020891c>] (gic_handle_irq) from [<c0877500>] (__irq_svc+0x40/0x54) 
[    1.516683] Exception stack(0xeb0e1f98 to 0xeb0e1fe0) 
[    1.521725] 1f80:                                                       ffffffed 00000000 
[    1.529894] 1fa0: 000005a6 c0222da0 00000000 eb0e0000 c0c970a8 c0880a30 00000000 eb0e0000 
[    1.538061] 1fc0: ffffffed 00000000 00000000 eb0e1fe0 c020f77c c020f780 60000113 ffffffff 
[    1.546235] [<c0877500>] (__irq_svc) from [<c020f780>] (arch_cpu_idle+0x34/0x40) 
[    1.553630] [<c020f780>] (arch_cpu_idle) from [<c028c4d4>] (cpu_startup_entry+0x1a4/0x324) 
[    1.561889] [<c028c4d4>] (cpu_startup_entry) from [<002089c4>] (0x2089c4) 
[    1.568667] CPU2: stopping 
[    1.571369] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G        W     3.16.4-200.fc20.armv7hl #1 
[    1.579804] [<c0218310>] (unwind_backtrace) from [<c021270c>] (show_stack+0x18/0x1c) 
[    1.587541] [<c021270c>] (show_stack) from [<c0870e6c>] (dump_stack+0x70/0x8c) 
[    1.594758] [<c0870e6c>] (dump_stack) from [<c0215d68>] (handle_IPI+0xd4/0x170) 
[    1.602060] [<c0215d68>] (handle_IPI) from [<c020891c>] (gic_handle_irq+0x68/0x70) 
[    1.609623] [<c020891c>] (gic_handle_irq) from [<c0877500>] (__irq_svc+0x40/0x54) 
[    1.617094] Exception stack(0xeb0e3f98 to 0xeb0e3fe0) 
[    1.622135] 3f80:                                                       ffffffed 00000000 
[    1.630305] 3fa0: 000005f6 c0222da0 00000000 eb0e2000 c0c970a8 c0880a30 00000000 eb0e2000 
[    1.638473] 3fc0: ffffffed 00000000 00000000 eb0e3fe0 c020f77c c020f780 60000113 ffffffff 
[    1.646645] [<c0877500>] (__irq_svc) from [<c020f780>] (arch_cpu_idle+0x34/0x40) 
[    1.654035] [<c020f780>] (arch_cpu_idle) from [<c028c4d4>] (cpu_startup_entry+0x1a4/0x324) 
[    1.662292] [<c028c4d4>] (cpu_startup_entry) from [<002089c4>] (0x2089c4) 
[    1.669069] CPU3: stopping 
[    1.671770] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G        W     3.16.4-200.fc20.armv7hl #1 
[    1.680205] [<c0218310>] (unwind_backtrace) from [<c021270c>] (show_stack+0x18/0x1c) 
[    1.687941] [<c021270c>] (show_stack) from [<c0870e6c>] (dump_stack+0x70/0x8c) 
[    1.695156] [<c0870e6c>] (dump_stack) from [<c0215d68>] (handle_IPI+0xd4/0x170) 
[    1.702458] [<c0215d68>] (handle_IPI) from [<c020891c>] (gic_handle_irq+0x68/0x70) 
[    1.710021] [<c020891c>] (gic_handle_irq) from [<c0877500>] (__irq_svc+0x40/0x54) 
[    1.717493] Exception stack(0xeb0e5f98 to 0xeb0e5fe0) 
[    1.722534] 5f80:                                                       ffffffed 00000000 
[    1.730703] 5fa0: 0000063c c0222da0 00000000 eb0e4000 c0c970a8 c0880a30 00000000 eb0e4000 
[    1.738871] 5fc0: ffffffed 00000000 00000000 eb0e5fe0 c020f77c c020f780 60000113 ffffffff 
[    1.747043] [<c0877500>] (__irq_svc) from [<c020f780>] (arch_cpu_idle+0x34/0x40) 
[    1.754434] [<c020f780>] (arch_cpu_idle) from [<c028c4d4>] (cpu_startup_entry+0x1a4/0x324) 
[    1.762690] [<c028c4d4>] (cpu_startup_entry) from [<002089c4>] (0x2089c4) 
[    1.769472] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 


Version-Release number of selected component (if applicable):
kernel-3.16.4-200.fc20.armv7hl

How reproducible:
every time

Steps to Reproduce:
1. install Fedora 20 GOLD with kernel-3.11.10-301.fc20.armv7hl
2. yum update dracut
3. yum update kernel
4. reboot

Actual results:
kernel WARNING followed shortly after by a panic when it cannot find the root filesystem

Expected results:
normal boot

Additional info:
Apparently the Fedora Updates mirrors are not all in sync.  Sometimes my system yum updates to the 3.15.10-201.fc20.armv7hl kernel which works fine.