[Top] [All Lists]

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

To: nagalakshmi veeramallu <>
Subject: Re: in mips how to change the start address to the new second boot loader ?
From: Geert Uytterhoeven <>
Date: Tue, 21 Apr 2009 16:10:20 +0200
Cc: "Kevin D. Kissell" <>, "M. Warner Losh" <>,,
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=3QIeKNTfCH5cxk4/brs2Q1wBYZk3W9yIANING2w5MqY=; b=iraSoFLh15AqsIU57Z9pH0hJXwhqBzZxD7WLaDlPT4yPlggy1C6jas40Cqxj3tOghE Hk/E1MVodiTI6g8vAsz7eT8sK1XCADCjzvfJnhYUAMVXxQs7NBcFHgCLWrBAIbs2+F0G JtLKKxeAK0RZ/iYVAyH2MWNw/k1s+tC5bW/4A=
Domainkey-signature: a=rsa-sha1; c=nofws;; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=rTV7dq6eAnVrMaudAGJ0w4WFbC8q1OcsMB71wUNKxU4810zyTZmn8/TItKybMhFKk6 QVO72SXb6jyQb5sw4mtEx25QCUbELgr+6LiKocNOGMcqAKmIxVMvuQfaEIUo2NdpXvx1 wiAF3A64SItEHRwx4+yDDOiIvk9whKgTKc/xU=
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <> <> <>
On Tue, Apr 21, 2009 at 15:46, nagalakshmi veeramallu
<> 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 <>
> 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.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

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

<Prev in Thread] Current Thread [Next in Thread>