[U-Boot] [PATCH V2 2/2] ARM: tegra: Add p2371-0000 board

[Thierry Reding <treding@nvidia.com>]

On Wed, Jul 29, 2015 at 02:16:33PM -0600, Stephen Warren wrote:
> From: Stephen Warren <swarren@nvidia.com>
> 
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
> v2: Use named constants for PMIC I2C and register addresses.
> ---
>  arch/arm/dts/Makefile                              |   1 +
>  arch/arm/dts/tegra210-p2371-0000.dts               |  59 +++++
>  arch/arm/mach-tegra/tegra210/Kconfig               |   6 +
>  board/nvidia/p2371-0000/Kconfig                    |  12 +
>  board/nvidia/p2371-0000/MAINTAINERS                |   6 +
>  board/nvidia/p2371-0000/Makefile                   |   8 +
>  board/nvidia/p2371-0000/p2371-0000.c               |  51 ++++
>  board/nvidia/p2371-0000/pinmux-config-p2371-0000.h | 260 +++++++++++++++++++++
>  configs/p2371-0000_defconfig                       |  16 ++
>  include/configs/p2371-0000.h                       |  72 ++++++
>  10 files changed, 491 insertions(+)
>  create mode 100644 arch/arm/dts/tegra210-p2371-0000.dts
>  create mode 100644 board/nvidia/p2371-0000/Kconfig
>  create mode 100644 board/nvidia/p2371-0000/MAINTAINERS
>  create mode 100644 board/nvidia/p2371-0000/Makefile
>  create mode 100644 board/nvidia/p2371-0000/p2371-0000.c
>  create mode 100644 board/nvidia/p2371-0000/pinmux-config-p2371-0000.h
>  create mode 100644 configs/p2371-0000_defconfig
>  create mode 100644 include/configs/p2371-0000.h

Sorry for being late on this. I just rebased my tree on origin/master
and got rid of my preliminary P2371 patches in favour of this only to
notice that it doesn't work the way it used to. For example I used to
use:

	# ums 0 mmc 1

to upload kernel, DTB and such to the external SD card. Unfortunately
that no longer works with this version of the patches. I tried to see
what the differences are but couldn't spot anything. I see that dmesg
shows a bunch of USB device reset messages, and failures to read the
superblock on /dev/sdc, which is what the mass storage shows up as. I
also tried porting a couple of changes from my earlier tree over to
master, but to no avail.

Any ideas what could be the reason here? Does the external SD card work
for anybody else?

I also noticed two other things:

> diff --git a/configs/p2371-0000_defconfig b/configs/p2371-0000_defconfig
[...]
> +CONFIG_USE_PRIVATE_LIBGCC=y

Why do we need this?

> diff --git a/include/configs/p2371-0000.h b/include/configs/p2371-0000.h
[...]
> +#define COUNTER_FREQUENCY	38400000

As far as I know the system counter is actually clocked by clk_m, which
on most (all?) Tegra210 platforms will be configured to run at half the
oscillator frequency (19.2 MHz). This is corroborated by the fact that
running:

	# sleep 5

actually takes 10 seconds rather than the expected 5. Changing the above
to 19200000 fixes that.

Thierry

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