[U-Boot] [PATCH 3/9] Tegra: T30: Add CPU (armv7) files

[Stephen Warren]

On 09/13/2012 02:16 PM, Tom Warren wrote:
> Stephen,
> 
> On Thu, Sep 13, 2012 at 1:03 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> On 09/12/2012 04:10 PM, Tom Warren wrote:
>>
>>> diff --git a/arch/arm/cpu/armv7/tegra30/cmd_enterrcm.c b/arch/arm/cpu/armv7/tegra30/cmd_enterrcm.c
>>
>> This whole file is definitely common with Tegra20.
> 
> I'm going through your previous comments, but I'll just reply quickly
> to this one since it needs clearing up.
> 
> The intent of this first series of patches for Tegra30 was just to get
> to the command prompt on T30 in the quickest way, while impacting
> Tegra20 code as little as possible. Hence, I used Tegra20 files to
> create a Tegra30 build, and as I ported it to T30 HW, I tried to
> eliminate what I could that I knew for sure was T20-specific and not
> useful. But I've made no effort to combine common files/code in this
> initial pass. I think it's much easier to understand and review these
> files as a separate SoC build, rather than having to parse
> common/combined files and code. I intend to do the
> combination/common-izing of the TegraXX builds once I have a
> reasonable T30 build in u-boot-tegra, perhaps even before I start
> porting the drivers.  But this is the initial approach I took.
> Hopefully it'll be an acceptable course - I'd hate to have to
> back-track.

To be honest, it seems like the patch to add the Tegra30 deltas to the
existing Tegra20 code would be massively smaller than duplicating all of
Tegra20 as Tegra30 and applying those same changes. In the kernel, we
have both Tegra20 and Tegra30 support with run-time differentiation, and
the number of places where we have to do something different is not that
large at all. With the current patch series, there's a huge amount of
code to wade through, so spotting any places that haven't been updated
for Tegra30, or weren't intended to be updated yet, is somewhat painful.