Re: [Freemint-discuss] Ssystem( ) and ColdFire processors

[David G. <dga...@gm...>]

2018-04-25 9:14 GMT+02:00 David Gálvez <dga...@gm...>:
>
>
> The information given by this system call is independent from the
> machine you're running the kernel on, so it can be a bit confusing.
> It's the option it was used to compile the kernel.
> If you're using a 060 kernel with FireTOS it will return 68060 but if
> you are using a 5475 kernel it will return a ColdFire kernel with
> isa_b instruction set.
> From the documentation:
> "This is not the same as the _CPU cookie value. The _CPU cookie
> specifies the CPU physically present in the machine, while the
> S_OSCOMPILE indicates the processor type selected at the time when the
> system was compiled. In other words, running a 68000-compiled kernel
> will return a 0x00 here, even if the machine is running 68040 or
> something."

I've just had a real situation where to know some compile time flags
has been useful.
I was testing transferring files to/from a USB device with a kernel
with -DOLDTOSFS flag, after doing some transfers (it's a 100 MB zip
file and through the ROM-port it takes some minutes) I wasn't sure if
I loaded the right kernel, then I remember that a XaAES's menu option
shows the flags the kernel running has been built with, and I saw that
it was the wrong kernel, without the -DOLDTOSFS flag.