[RFC PATCH v1 0/8] ARM: at91: Add pbl support to skov-arm9cpu

Sam Ravnborg sam at ravnborg.org
Sun May 15 12:37:59 PDT 2022

The following is the current set of patches so far to support
PBL for the skov-arm9cpu.

The pwm is not really part of this - but it is part of the story.
The patch-set was triggered when someone reported a bug in the 
atmel pwm code. The code did not build - so I ported it over.
Now I wanted to boot the target, but at91bootstrap no longer
supports the at91sam9263. So I decided to try to make it work
in barebox. I have tried this before and failed - but it should
be possible...

What I have made is modelled on top of all the great work
for other more modern atmel bouards.

This is an RFC - because the code does not yet work :-(
It fails to mount the SD Card - for reasons I am yet to discover.

Most of the code is attempted to be generic so we can use it
for other targets.

Feedback on the general structure would be nice.
But otherwise just consider this a short status that something
is in the works and I may return to this later - no promises
on the timeframe though.


Sam Ravnborg (8):
      pwm: atmel: Fix build and update
      ARM: at91: Provide at91_mux_pio_pin for use in lowlevel
      ARM: at91: Add at91sam9 xload_mmc for PBL use
      ARM: at91: Add extra register definitions
      ARM: at91: Add lowlevel helpers for at91sam9263
      ARM: at91: Make sdramc.h useable in multi image builds
      ARM: at91: Add initialize function to sdramc
      ARM: at91: Add xload support to skov-arm9cpu

 arch/arm/boards/skov-arm9cpu/lowlevel.c            | 148 +++-----
 arch/arm/mach-at91/Kconfig                         |   4 +-
 arch/arm/mach-at91/Makefile                        |   4 +-
 arch/arm/mach-at91/at91sam9_sdramc_ll.c            |  67 ++++
 arch/arm/mach-at91/at91sam9_xload_mmc.c            | 115 +++++++
 arch/arm/mach-at91/include/mach/at91_pmc.h         |   2 +
 arch/arm/mach-at91/include/mach/at91sam9263.h      |  14 +
 .../mach-at91/include/mach/at91sam9263_matrix.h    |  23 +-
 arch/arm/mach-at91/include/mach/at91sam926x.h      |   2 +
 arch/arm/mach-at91/include/mach/at91sam9_sdramc.h  | 165 ++++++---
 arch/arm/mach-at91/include/mach/gpio.h             |  25 ++
 arch/arm/mach-at91/include/mach/sam92_ll.h         |  54 +++
 arch/arm/mach-at91/include/mach/xload.h            |   4 +
 arch/arm/mach-at91/sam9263_ll.c                    | 216 ++++++++++++
 drivers/pwm/pwm-atmel.c                            | 383 +++++++++++++++------
 images/Makefile.at91                               |   5 +
 16 files changed, 981 insertions(+), 250 deletions(-)

More information about the barebox mailing list