Messages in this thread | | | Subject | Re: [PATCH 2/2] powerpc/8xx: Add microcode patch to move SMC parameter RAM. | From | Christophe Leroy <> | Date | Tue, 14 May 2019 10:31:32 +0200 |
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Le 14/05/2019 à 08:56, Michael Ellerman a écrit : > Christophe Leroy <christophe.leroy@c-s.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@c-s.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.
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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