Re: [ECOS] creating a new template

[Gary Thomas <gary@mlbassoc.com>]

Gary Thomas wrote:
> Gregg Levine wrote:
>> On Dec 22, 2007 5:59 AM, Gary Thomas <gary@mlbassoc.com> wrote:
>>> Gregg Levine wrote:
>>>> Hello!
>>>> In the collections of templates I see three Intel386 based PC ones. I
>>>> would like to create one that contains everything except networking by
>>>> means of the preselected devices.
>>>>
>>>> Can anyone suggest the steps needed?
>>>>
>>> Firstly, you probably mean "target", not "template".
>>> Targets are ways of instantiating a particular hardware
>>> platform (architecture, 'motherboard', devices, etc).
>>> Templates describe collections of software packages
>>> and are hardware neutral.
>>>
>>> For example, the 'pc_i82559' target describes a generic
>>> PC which has, in particular, hardware support for the
>>> Intel 82559 PCI ethernet controller.  If you build eCos
>>> like this:
>>>   % ecosconfig new pc_i82559 minimal
>>>   % ecosconfig tree
>>>   % make
>>> the resulting eCos kernel will run on that PC [box], but
>>> since the template used (minimal) does not include any
>>> networking support packages, the fact that the target
>>> specified the i82559 driver is irrelevant.  In fact,
>>> you would get an identical eCos kernel from
>>>   % ecosconfig new pc_i82544 minimal
>>>   % ecosconfig tree
>>>   % make
>>>
>>> Given the way that CDL is used to enable/disable the
>>> building of drivers, etc, the ethernet drivers in either
>>> of these examples won't even be built.
>>>
>>> If you don't want networking, then don't use a template
>>> which includes network support.  If you examine the templates,
>>> you'll see that only 'net', 'lw_ip' and 'all' include networking.
>>> If you start with any other template, you have to explicitly
>>> add network support, regardless of what hardware device
>>> drivers the particular target may support.
>>>
>> Hello!
>> I see.
>> My basic problem is that my test device, doesn't use the normal
>> methods of supplying a networking device. It uses PCMCIA cards to
>> supply them.
>>
>> And when I instruct the basic PC one to add both PCMCIA things to it,
>> the first one goes in, that's for storage it seems, the second one,
>> for networking does not.
>>
>> What I want to do is to produce a PC one, without the I82544 included
>> in it. Equivalent to a bare PC board that was created without the
>> embedded networking and perhaps even USB that was popular at the start
>> of the time period.
> 
> Just create a new _target_ which has the characteristics
> that you need.  Note that in general adding hardware drivers
> is done in templates and not by adding additional packages
             ^^^^^^^^^
             targets    [even I had to be careful with the terms!]
> (in fact, the config tool won't even let you try!)
> 


-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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