PowerPC 85xx board are caused die by Commit: 864b9e6fd76489aab422bac62162f57c52e06ed8(powerpc: Use lwarx/ldarx hint in bit locks)

[Andrew Liu]

Hi Guys:
I have done several experiments on  fsl_8548cds and fsl_p2020rdb, pinpointed
the commit: 864b9e6fd76489aab422bac62162f57c52e06ed8(powerpc: Use
lwarx/ldarx hint in bit locks)  cause the bootup stalledd.

"
Filename 'fsl_8548cds/uImage'.
Load address: 0x1000000
Loading: #################################################################
     #######################################
done
Bytes transferred = 1526546 (174b12 hex)
Speed: 100, full duplex
Using eTSEC0 device
Filename 'sliu/fsl_8548cds/mpc8548cds.dtb'.
Load address: 0xc00000
Loading: #
done
Bytes transferred = 9993 (2709 hex)
## Booting image at 01000000 ...
   Image Name:   Linux-2.6.34-rc1-00005-g522dba7
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1526482 Bytes =  1.5 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
   Booting using the fdt at 0xc00000
   Loading Device Tree to 007fb000, end 007fd708 ... OK
"

I guess all 85xx or booke board has this issue.

Thanks
Andrew
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