[okl4-developer] Question about Build system (Platform related)

[Geoffrey Lee]

On Thu, May 08, 2008 at 11:03:15AM +0800, Sean wrote:
> Dear all
> 
> Now I want to port the OKL4 to a new platform. But I had some questions
> about the build system.
> 
> 1. Does anyone give me some explanation of the relationship between
> platform/s3c2410/tools/machine.py and the source codes in
> platform/s3c2410/pistachio/src/


Hi Sean

There is a brief location outline of the source files in the README 
file at the top level source directory of the OKL4 distribution.

> 
> For example,  the content in machine.py
> class s3c2410(arm920t):
>     platform = "s3c2410"
>     platform_dir = "s3c2410"
>     memory = arm920t.memory.copy()
>     timer_driver = "s3c2410_timer"
>     rtc_driver = "s3c2410_rtc"
>     serial_driver = "s3c2410_uart"
>     lcd_driver = "s3c2410_lcd"
>     touch_driver = "s3c2410_touch"
>     spi_driver = "s3c2410_spi"
>     drivers = [timer_driver, serial_driver, lcd_driver]
>     memory_timer = [(0x51000000, 0x51001000)]
>     interrupt_timer = [11, 12]
>     memory_serial = [(0x50000000, 0x50001000)]
>     interrupt_serial = [32, 33]
>     memory_lcd = [(0x4d000000, 0x4d001000)]
>     interrupt_lcd = [16]
>     memory_rtc = [(0x57000000, 0x57001000)]
>     interrupt_rtc = [30]
>     v2_drivers = [("s3c2410_timer", "vtimer", memory_timer,
> interrupt_timer),
>                  ("s3c2410_uart", "vserial", memory_serial,
> interrupt_serial),
>                  ("s3c2410_lcd", "vlcd", memory_lcd, interrupt_lcd),
>                  ("s3c2410_rtc", "vrtc", memory_rtc, interrupt_rtc)
>                  # ("s3c2410_spi", "vbus"),
>                  # ("s3c2410_touch", "vtouch"),
>                  ]
> 
> and the function startup_system_mmu() in arch/arm/pistachio/src/init.cc
>     if (!Platform::init(Platform::API_VERSION,
> PlatformSupport::API_VERSION))
>         for(;;);
> 
> How does the class "Platform" declare?

The Platform is a namespace, it is located for ARM in 

arch/arm/pistachio/include/platform.h.

To find specifically where something is located, I like to follow
the rule outlined in the README and then use grep(1) to look for it.

> 
> 
> 2. Where is the directories of the include files, and the relationship on
> different paths
> For example:
> in platform/s3c2410/pistachio/src/head.spp
> #include <kernel/l4.h>
> #include <kernel/arch/asm.h>
> #include <kernel/cpu/syscon.h>
> 
> I can't find the path like "include/kernel/" in the source tree.

The include files are copied over from the source to the build directory.

So for example, 

#include <kernel/l4.h> 

is actually located in:

build/pistachio/include/kernel/l4.h

If you would like to see how the build system exactly works in copying
these files over and what the include paths look like, you can 
specify verbose_str=True on the build line.


> 
> Really need your helps, thanks very much!
> 
> Best Regards,
> Sean

	-gl


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