[U-Boot] [PATCH 5/5] tegra: Implement board_pre_console_panic() for Seaboard

Stephen Warren swarren at wwwdotorg.org
Tue Mar 20 02:22:48 CET 2012

On 03/19/2012 04:59 PM, Simon Glass wrote:
> Hi Stephen,
> On Mon, Mar 19, 2012 at 2:18 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> On 03/19/2012 02:27 PM, Simon Glass wrote:
>>> We enable this feature on all UARTs for Seaboard. This ensures that a
>>> message is printed if CONFIG_OF_CONTROL is in use and a value device tree
>>> is not available.
>> Why not just enabled this on UARTD, since that's what Seaboard uses?
>> I guess some derivatives do use UARTB too, which makes things quite
>> painful. Perhaps at least limit this to UARTB + UARTD, and not all the
>> others?
> At the moment we can use Seaboard as a generic Tegra2 board, so we
> want the widest possible select of UARTs. I think there is one board
> that uses A?
> Really I would prefer that we explicitly create a generic Tegra2
> board, once the fdt stuff is bedded in.

Well, one of Wolfgang's main objections was blasting the panic message
through all possible UARTs, which might send junk to something other
than a debug UART (e.g. machinery and life support systems were
mentioned). This change doesn't seem to solve that. For low-level debug
like this, shouldn't we just route it to one single UART that the config
file selects?

We can certainly think about refactoring things into a unified board
file, but that seems like something unrelated to do later...

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