[bfin] Add more cpu types

[Jie Zhang]

Bernd Schmidt wrote:
> Jie Zhang wrote:
>> This patch makes -mcpu accept the silicon revision of the processor. 
>> Now -mcpu option has the form:
>>
>> -mcpu=cpu[-sirevision]
>>
>> Currently, cpu can be one of `bf522', `bf525', `bf527', `bf531', 
>> `bf532', `bf533', `bf534', `bf536', `bf537', `bf538', `bf539', 
>> `bf542', `bf544', `bf548', `bf549', and `bf561'. The optional 
>> sirevision specifies the silicon revision of the target Blackfin 
>> processor. Any workarounds available for the targeted silicon revision 
>> will be enabled. If sirevision is `none', no workarounds are enabled. 
>> If sirevision is `any', all workarounds for the targeted processor 
>> will be enabled. The __SILICON_REVISION__ macro is defined to two 
>> hexadecimal digits representing the major and minor numbers in the 
>> silicon revision. If sirevision is `none', the __SILICON_REVISION__ is 
>> not defined. If sirevision is `any', the __SILICON_REVISION__ is 
>> defined to be 0xffff. If this optional sirevision is not used, GCC 
>> assumes the latest known
>> silicon revision of the targeted Blackfin processor. Without this 
>> option, `bf532' is used as cpu by default.
>>
>> OK to commit?
> 
> Not too happy about the excessive multilibs for a not very interesting 
> hardware workaround, but since this matches what we do in our tree, I 
> guess it's best to apply this for now.
> 
Committed as r128597. Thanks.

Jie