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Re: in mips how to change the start address to the new second boot load

To: nagalakshmi veeramallu <lucky.veeramallu@gmail.com>
Subject: Re: in mips how to change the start address to the new second boot loader ?
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Tue, 21 Apr 2009 16:10:20 +0200
Cc: "Kevin D. Kissell" <kevink@paralogos.com>, "M. Warner Losh" <imp@bsdimp.com>, florian@openwrt.org, linux-mips@linux-mips.org
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On Tue, Apr 21, 2009 at 15:46, nagalakshmi veeramallu
<lucky.veeramallu@gmail.com> wrote:
> hi,
>          --          if we set environmental variable “start” as “go
> new_address”, will it go directly to the new bootloader in the next
> power-on.
> what about using system environmental "start" ,can you tell me at which
> context after power on environmental variables come onto picture.

Environment variables are parsed by the boot loader, whose code resides at,
guess what, 0x1fc00000...

> On Tue, Apr 21, 2009 at 6:55 PM, Kevin D. Kissell <kevink@paralogos.com>
> wrote:
>>
>> nagalakshmi veeramallu wrote:
>>
>> -           Mips atlas board has jumper  which will redirect accesses from
>> “Bootcode” range to either “Monitor flash” (0x1e000000) or the upper 4MB of
>> “System flash” (0x1dc00000) based on jumper settings. if my kmc board have
>> some jumper like this, can I redirect the start address.
>>
>> Of course, what is really happening there is that the Atlas boot ROM has a
>> vector at 0x1fc00000 which reads the jumper and jumps to one address or the
>> other depending on the jumper setting. If you control what is in ROM at
>> 0x1fc00000 and you have a software-readable jumper on your KMC board, you
>> can do the same thing.
>>
>>           Regards,
>>
>>           Kevin K.
>>
>
>



-- 
Gr{oetje,eeting}s,

                                                Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds

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