Re: [openrisc] Question) Address transfer between IMMU & ICache

[Jim Tong <jtong@richcore.com>]

Sungyon:
   I saw many similar problems. When jump or exception
happened, the Icache returned the old data. My
recommendation is to design your own cache controller.

Jim

--- SUNGYON@aaww.com wrote:
> Dear Lampret & members,
> 
> I'm doing MP3 RTL simulation in or1k/mp3 directory.
> It seems that The MP3 draft is concuded with ICache
> disabled.
> I enabled the ICache, and run the minimad but this
> failed.
> 
> Through the waveform analysis, on the occurrence of
> address jump,
> I found that the communication between IMMU & ICache
> seems to have a
> problem.
> 
> For example, for 4k ICache & IMMU disabled
> on the jump from 8000-8758 to 8000-a708
> Since IMMU provides 8000-8708 (which is {previous
> tag range(8000-8),
> current index(708 of 8000-a708)}) to ICache,
> The Icache decides hits with 8000-8708 and the
> 8000-8708 is executed
> really. It's wrong.
> The executed.log shows that 8000-a708 is executed
> with instruction of
> 8000-8708.
> For summary, IMMU does not be prividing right
> address to ICache.
> 
> I think it's difficult to talk about this problem in
> detail, since we are
> not in one desk.
> But If anyone haves any helpful idea about this,
> give me.
> Thank you in ahead.
> 
> Regards, Sungyon in South Korea.
> 
> 
> 
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