linux-stable.git/arch/powerpc/boot, branch v6.4.2

powerpc/boot: Disable power10 features after BOOTAFLAGS assignment

2023-05-12T06:20:18+00:00

When building the boot wrapper assembly files with clang after
commit 648a1783fe25 ("powerpc/boot: Fix boot wrapper code generation
with CONFIG_POWER10_CPU"), the following warnings appear for each file
built:

  '-prefixed' is not a recognized feature for this target (ignoring feature)
  '-pcrel' is not a recognized feature for this target (ignoring feature)

While it is questionable whether or not LLVM should be emitting a
warning when passed negative versions of code generation flags when
building assembly files (since it does not emit a warning for the
altivec and vsx flags), it is easy enough to work around this by just
moving the disabled flags to BOOTCFLAGS after the assignment of
BOOTAFLAGS, so that they are not added when building assembly files.
Do so to silence the warnings.

Fixes: 648a1783fe25 ("powerpc/boot: Fix boot wrapper code generation with CONFIG_POWER10_CPU")
Link: https://github.com/ClangBuiltLinux/linux/issues/1839
Reviewed-by: Nicholas Piggin 
Signed-off-by: Nathan Chancellor 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230427-remove-power10-args-from-boot-aflags-clang-v1-1-9107f7c943bc@kernel.org

powerpc: drop PowerQUICC II Family ADS platform support

2023-04-20T03:21:48+00:00

Based on documentation revision dates, this MPC82xx pq2fads system
predates the MPC8272-ADS variant by about a year and only has 1/2
the amount of RAM (32MB) -- largely making it useless with a modern
v6.x kernel from today.

Similar to the MPC8272-ADS the pq2fads also supported other 82xx CPU
variants, had 8MB flash, and like the 8272 ADS platform, was on a fairly
large PCB in order to have space for breakout connectors for all features.

These 82xx platforms are two decades old, and originally made for a
small group of industry related people in order to assist in new OEM
board designs.  Given that, it makes sense to remove support today.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230224204959.17425-3-paul.gortmaker@windriver.com

powerpc: drop MPC8272_ADS platform support

2023-04-20T03:21:48+00:00

The MPC8272-ADS also supported other 82xx CPU variants, had 64MB RAM,
8MB flash, and like the 85xx ADS platforms, was on a fairly large PCB
in order to have space for breakout connectors for all the features.

These 82xx platforms are two decades old, and originally made for a
small group of industry related people in order to assist in new OEM
board designs.  Given that, it makes sense to remove support today.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230224204959.17425-2-paul.gortmaker@windriver.com

powerpc: drop HPCD/MPC8610 evaluation platform support

2023-04-20T03:21:47+00:00

This evaluation platform was essentially a single core 8641 with
integrated graphics/display support - in an effort to reduce chip count
on kiosk and similar applications.

Compared to other evaluation platforms considered for removal in other
recent commits, this platform was relatively rare.  Unlike all the other
10+ platforms, I couldn't find any documentation on it - just a link to
downloading the 2007 era BSP in "LTIB" format as was done back then.

With all that in mind, it seems prudent to remove it here in 2023.

Signed-off-by: Paul Gortmaker 
[mpe: Drop stale reference to MPC8610_HPCD in 86xx/Kconfig]
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230225201318.3682-4-paul.gortmaker@windriver.com

powerpc: drop HPC-NET/MPC8641D evaluation platform support

2023-04-20T03:21:47+00:00

There is no denying that this was an interesting platform in its day.
Access to a SMP powerpc platform became a bit more obtainable for folks
in the BSP industry in the 2007 era, thanks to this platform.

Add to that the move to the black Antec case vs. the generic white 2005
era case of the MPC8548CDS or the retro 1950s 1/2 height horizontal case
of the HPC II, and it was pretty interesting to people like myself then.

However, like all the other evaluation platforms, the overall system
was complex out of necessity, as it tried to showcase all possible
features and use-cases.  That included an AMP option, where you could run
two bootloaders and two kernels over two serial consoles.  Peripheral
sharing got a bit more tricky when you got to the hard disk and similar.

In any case we still have the same circumstance.  A relatively rare and
expensive evaluation platform that is now 15+ years old and not out there
in large numbers in the general public.  Removal in 2023 just makes sense.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230225201318.3682-3-paul.gortmaker@windriver.com

powerpc: drop HPC II (MPC7448) evaluation platform support.

2023-04-20T03:21:47+00:00

This was an interesting platform - it was the 1st instance of a
respin of earlier 130nm 74xx CPUs on 90nm and systems using MPC7448
were positioned as a rack server platform solution.

Given that, the evaluation platform (at least the one I had) was shipped
in a horizontal 1/2 height Antec desktop case with retro styling and
colours, despite the fact the docs explicitly stated that the HPC II is
not a desktop machine (noting it had no gfx or legacy PC I/O support).

Historic trivia aside, this was the 1st introduction of the e600
procfam as an evolution from the earlier G4.

However even with the claim to being "1st e600" it seems the 2005+
era was turning its attention to multicore support and from my memory
this poor guy was quickly overshadowed by the dual core MPC8641D.

All that aside, we are once again looking at 15+ year old evaluation
platforms that were not widely distributed, so 2023 removal makes sense.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230225201318.3682-2-paul.gortmaker@windriver.com

powerpc: drop MPC832x_MDS platform support

2023-04-20T03:21:47+00:00

This final variant in the e300 family of Modular Development System
(MDS) in this series was actually aimed at feature reduction - things
like floating point and ethernet were removed in order to make for a
lower power and lower cost system.

Like all the MDS systems, it was meant as a vehicle to get the CPU out
early to hardware OEMs so software and board development could take place
in parallel.

These were made in limited numbers and availability preference was given
to partners who were planning to make their own boards.

Given that the whole reason for existence was to assist in enabling new
board designs [not happening for 10+ years], and that they weren't
generally available, and that the hardware wasn't really hobbyist friendly
even for retro computing, it makes sense to retire the support for this
particular platform.

Signed-off-by: Paul Gortmaker 
Acked-by: Li Yang 
[mpe: Drop stale reference to MPC832x_MDS in arch/powerpc/boot/Makefile]
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230220115913.25811-5-paul.gortmaker@windriver.com

powerpc: drop MPC837x_MDS platform support

2023-04-20T03:21:47+00:00

This next evolutionary step in the e300 family of Modular Development
System (MDS) still has, at its core component, a full length card with a
PCI edge.  No case.  Serial and network connectors were on card, so it
could optionally be fitted with plastic stand-offs and run stand-alone
off a power brick.

This is very similar to the MPC834x_MDS and MPC836x_MDS removed in the
prior commits, but with this board variant as yet another evolutionary
step.  SATA and PCI-e were now available.  But overall the form factor
and design goals were unchanged.

Like all the MDS systems, it was meant as a vehicle to get the CPU out
early to hardware OEMs so software and board development could take place
in parallel.

These were made in limited numbers and availability preference was given
to partners who were planning to make their own boards.

Given that the whole reason for existence was to assist in enabling new
board designs [not happening for 10+ years], and that they weren't
generally available, and that the hardware wasn't really hobbyist friendly
even for retro computing, it makes sense to retire the support for this
particular platform.

Signed-off-by: Paul Gortmaker 
Acked-by: Li Yang 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230220115913.25811-4-paul.gortmaker@windriver.com

powerpc: drop MPC836x_MDS platform support

2023-04-20T03:21:46+00:00

This 2006 era Modular Development System (MDS) has, at its core component,
a full length card with a PCI edge.  No case.  Serial and network
connectors were on card, so it could optionally be fitted with plastic
stand-offs and run stand-alone off a power brick.

This is very similar to the MPC834x_MDS removed in the prior commit, but
with this board variant as an evolutionary step.  DDR2 was now an option,
and the card edge was revised down to PCI-32 as PCI-64 never got traction.
But overall the form factor and design goals were unchanged.

Like all the MDS systems, it was meant as a vehicle to get the CPU out
early to hardware OEMs so software and board development could take place
in parallel.

To that end, the BGA CPU was held in place with a mechanical spring loaded
pressure assembly (vs. solder) so that early rev silicon could be replaced
in the field.  Not for COTS deployment!

These were made in limited numbers and availability preference was given
to partners who were planning to make their own boards.

Given that the whole reason for existence was to assist in enabling new
board designs [not happening for 10+ years], and that they weren't
generally available, and that the hardware wasn't really hobbyist friendly
even for retro computing, it makes sense to retire the support for this
particular platform.

Signed-off-by: Paul Gortmaker 
Acked-by: Li Yang 
[mpe: Drop stale reference to MPC836x_MDS in arch/powerpc/boot/Makefile]
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230220115913.25811-3-paul.gortmaker@windriver.com

powerpc: drop MPC834x_MDS platform support

2023-04-20T03:21:46+00:00

This 2006 era Modular Development System (MDS) has, at its core
component, a full length card with a PCI-64 edge.  No case.  Serial
and network connectors were on card, so it could optionally be fitted
with plastic stand-offs and run stand-alone off a power brick.

Like all the MDS systems, it was meant as a vehicle to get the CPU
out early to hardware OEMs so software and board development could
take place in parallel.

To that end, the BGA CPU was held in place with a mechanical spring
loaded pressure assembly (vs. solder) so that early rev silicon could
be replaced in the field.  Not for COTS deployment!

These were made in limited numbers and availability preference was
given to partners who were planning to make their own boards, like
our WR SBC8349 [since retired in v4.18 (2017, commit 3bc6cf5a86e5)]

Given that the whole reason for existence was to assist in enabling
new board designs [not happening for 10+ years], and that they weren't
generally available, and that the hardware wasn't really hobbyist
friendly even for retro computing, it makes sense to retire the
support for this platform.

Signed-off-by: Paul Gortmaker 
Acked-by: Li Yang 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20230220115913.25811-2-paul.gortmaker@windriver.com