linux-kernel - Re: [PATCH 2/2] powerpc/8xx: Add microcode patch to move SMC parameter RAM.

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Message-ID: <37465c0a-7d45-3bd7-cada-b203e92b419d@c-s.fr>
Date:   Tue, 14 May 2019 10:35:29 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Vitaly Bordug <vitb@...nel.crashing.org>,
        Scott Wood <oss@...error.net>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc/8xx: Add microcode patch to move SMC
 parameter RAM.



Le 14/05/2019 à 10:31, Christophe Leroy a écrit :
> 
> 
> Le 14/05/2019 à 08:56, Michael Ellerman a écrit :
>> Christophe Leroy <christophe.leroy@....fr> writes:
>>
>>> Some SCC functions like the QMC requires an extended parameter RAM.
>>> On modern 8xx (ie 866 and 885), SPI area can already be relocated,
>>> allowing the use of those functions on SCC2. But SCC3 and SCC4
>>> parameter RAM collide with SMC1 and SMC2 parameter RAMs.
>>>
>>> This patch adds microcode to allow the relocation of both SMC1 and
>>> SMC2, and relocate them at offsets 0x1ec0 and 0x1fc0.
>>> Those offsets are by default for the CPM1 DSP1 and DSP2, but there
>>> is no kernel driver using them at the moment so this area can be
>>> reused.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>> ---
>>>   arch/powerpc/platforms/8xx/Kconfig      |   7 ++
>>>   arch/powerpc/platforms/8xx/micropatch.c | 109 
>>> +++++++++++++++++++++++++++++++-
>>>   2 files changed, 114 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/powerpc/platforms/8xx/micropatch.c 
>>> b/arch/powerpc/platforms/8xx/micropatch.c
>>> index 33a9042fca80..dc4423daf7d4 100644
>>> --- a/arch/powerpc/platforms/8xx/micropatch.c
>>> +++ b/arch/powerpc/platforms/8xx/micropatch.c
>>> @@ -622,6 +622,86 @@ static uint patch_2f00[] __initdata = {
>>>   };
>>>   #endif
>>> +/*
>>> + * SMC relocation patch arrays.
>>> + */
>>> +
>>> +#ifdef CONFIG_SMC_UCODE_PATCH
>>> +
>>> +static uint patch_2000[] __initdata = {
>>> +    0x3fff0000, 0x3ffd0000, 0x3ffb0000, 0x3ff90000,
>>> +    0x5fefeff8, 0x5f91eff8, 0x3ff30000, 0x3ff10000,
>>> +    0x3a11e710, 0xedf0ccb9, 0xf318ed66, 0x7f0e5fe2,
>>
>> Do we have any doc on what these values are?
> 
> No we don't
> 
> 
>>
>> I get that it's microcode but do we have any more detail than that?
>> What's the source etc?
>>
> 
> There is an Engineering Bulletin (EB662) dated 2006 from Freescale which 
> slightly describe things and there are associated S-Record files 
> containing those values.

Find attached the said doc and files. Not sure it will go through the 
list. Can't find it on NXP website thought, that must be too old.

Christophe

> 
> And an old related message in the mailing list 
> https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg46038.html
> 
> Christophe

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