[U-Boot] merge arm64 to arm

[Måns Rullgård]

FengHua <fenghua at phytium.com.cn> writes:

>> FengHua <fenghua at phytium.com.cn> writes:
>> 
>> > hi tom,
>> > hi albert,
>> > yes, it's right. the u-boot could be more uniformly and maintainable
>> > if merging armv8 to arm architecture. I will try to migrate arm64 to
>> > armv8 subarchitecture of arm. do you have any other advice?
>> 
>> Why?  The architectures are vastly different, arm64 (aarch64) being only
>> loosely inspired by the 32-bit arm.  It is not like with x86/amd64 where
>> a lot of code can be shared.
>
> Of course, with a seperated architecture the arm64 code will be clear
> and simple. when it merged with arm a few file should be duplicated
> with the name "_v8" appended and many macro switch should be
> added. but most of the code will be in armv8 directory which
> paralleled with armv7. it seems that this implementation are more
> nice.

ARMv8 defines both a 32-bit (aarch32) and a 64-bit (aarch64) instruction
set.  The naming you are suggesting would be misleading.

-- 
Måns Rullgård
mans at mansr.com