[Libre-soc-dev] daily kan-ban update 14apr2021

[Tobias Platen]

On Wed, 2021-04-14 at 20:14 +0100, Luke Kenneth Casson Leighton wrote:
>     eq 0 0 True
> error on load invalid <<<<<-----
> setup: 0x0 0x0 0b0
> CIA NIA True 0 4
> 
> the instruction is operating perfectly correctly: the problem is that
> the instruction is being read *not from 0x0* but from the Virtual
> Memory re-mapped addres 0x400000 *which does not exist*
> 
> Read 0x0 from addr 0x400000
> addr 0x1000000
> value 0x0
> 
> therefore, on requesting the first instruction, with the value 0x0
> being read from the location 0x400000, the instruction being executed
> is not a lwz at all, it is a nop.
> 
> hence the illegal instruction.
> 
> l.
Understood, tomorow I am going to read the code to get a more deeper
understanding.
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