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USB hw bugs in SB600/SB700 southbridges


Regarding PR 40056, I have talked with AMD HW guys.

In result I got a list of three known HW bugs with links
to the workarounds/fixes in linux drivers.

1. SB600/SB700 USB EHCI IAA related bug
(commit logs describe the issue and shows the diff):;a=commitdiff;h=07d29b63ef6b39963ab37818653284d861cf55af;a=commitdiff;h=f8fa7571a928d6d0e1b7444b0ea69ec7dc7db3b6;a=commitdiff;h=e82cc1288fa57857c6af8c57f3d07096d4bcd9d9;hp=11171d1bde45eefa4fed605a5cf6ebe0e3d24395

2. SB700 USB 1.1 ISO OUT devices, such as USB speakers, may not function 
(commit log describes the issue and shows the diff):;a=commitdiff;h=ab1666c1364a209e6141d7c14e47a42b5f00eca2;hp=e12cc34527dcd945597c860c25aba92883a4a6a4

3. Fix SB600/SB700 USB subsystem hang bug
(commit log describes the issue and shows the diff):;a=commitdiff;h=b09bc6cbae4dd3a2d35722668ef2c502a7b8b093;hp=ee2f6cc7f9ea2542ad46070ed62ba7aa04d08871;a=commitdiff;h=0a99e8ac430a27825bd055719765fd0d65cd797f;hp=269f0532332410e97e3edeb78e6cd3bb940e52b4


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