Re: [Linux-7110-psion] nokia 9210

[Manon G. <li...@ma...>]

Hi Peter,

thanks for answering that quickly, I forwarded this to a friedn of mine and 
hope
he has access to aditional docs and/or Dev driver SDK. I'll inform you as 
soon as I'll recive answers.

Manon


--On Sunday, October 28, 2001 13:50:55 +0000 Peter van Sebille 
<pe...@yi...> wrote:

> Hi Manon,
>
> It was only a matter of time before this question would pop up :-)
> Anyway, there's "few" things that need changing to get things up
> and running on the Nokia 9210.
>
> Some terminology:
> - Arlo: the Arlo that we have now
> - Arlo-9210: modified Arlo to run on the Nokia 9210
> - ER5: Symbian OS version used on Psion devices like S5mx (and clones)
>   Series 7 / Netbook and Revo
> - ER6: Symbian OS version used in the Nokia 9210.
>
> 1) Arlo is an ER5 App built using the Symbian ER5 tool chain.
> Arlo-9210 needs to be built using the ER6 toolchain. This is
> almost trivial.
>
> 2) The "Arlo package" comprises of an Application and a device driver.
> The device driver is needed for a couple of reasons, most notably
> to read kernel memory (something that we can't do from user mode).
> In both ER5 and ER6, the standard publicly available SDK from Symbian
> doesn't allow you to build device drivers. The very first version
> of Arlo for the Series 5 (which runs on a pre ER5 OS: ER4 or even ER3)
> came with a binary and source code, but no toolchain to rebuild the
> driver. I've reverse engineered the device driver interface for ER5, so
> Arlo can be (re)build using the standard ER5 toolchain.
> For Arlo-9210, someone needs to either get their hands on the ER6 SDK for
> device drivers or reverse engineer the ER6 device driver interface like
> I did for ER5. The latter is not trivial :-(
>
> 3) Arlo knows where the ER5 kernel maintains its pagetables (read via
> the device driver). Someone once posted a list of kernel addresses on
> the newsgroup. This information is needed for Arlo to translate virtual
> addresses back into physical addresses.
> For Arlo-9210 someone needs to verify if these addresses are the same
> in ER6. Once you get the Arlo-9210 device driver running and you've
> build Arlo-9210 you can use the advanced options to peek around a bit
> in kernel memory.
>
> 4) An additional problem in the Series 7 was that the onboard watchdog
> was enabled. Once enabled, system software must reset the watchdog counter
> periodically (but before a programmed deadline) otherwise the hardware
> will issue a reset. Before the Arlo driver bootstraps the Linux kernel
> it will reprogram the watchdog to set the deadline as far as possible in
> the future (20 minutes I believe). Note that the watchdog can't be
> disabled once it has been enabled (other than by a reset).
> I knew how to do this because on the Series 7 the watchdog hardware is on
> board the SA1100 SoC. All relevant info can be found in the Intel specs.
> The only thing that was needed was to figure out where ER5 had mapped the
> watchdog hardware registers in virtual memory. One of Arlo's export menu
> options is to scan ER5 kernel memory for virtual memory regions mapped
> to hardware registers.
> I strongly suspect that the Nokia 9210 will have watchdog hardware on
> board and that ER6 will use it. If so, then Arlo-9210 must somehow
> reprogram the  watchdog in the same way as for the Series 7. This
> requires knowledge of hardware used in the 9210.
>
> 5) Linux kernel: Before doing any of the above, you should figure out
> what  hardware is used in the Nokia 9210. If it uses an SoC then you'll
> probably  get at least as far as the Series 7 port.
> What you ultimately need is: hardware info, hardware info and a bit of
> hardware info.
>
> I hope the above helps somewhat!
>
> cheers,
> 	Peter
>
>
> ps Anyone got good contacts with Nokia
> pps Deja-vue!!! ;-)
>
>
> Manon Goo wrote:
>>
>> Hi I tried to boot the kernel on the nokia 9210.
>>
>> The arlo boot loader does not start it exits with kern-exec code 3.
>>
>> How do I relink arlo.exe for the 9210 platform ? has someone already done
>> that ?
>>
>> Manon
>>
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