Re: [ECOS] Booting Linux from arm

["Gilles Bulthé" <gilles dot bulthe at phelma dot grenoble-inp dot fr>]

Hello,

considering the following 2 lines :
>> RAM: 0x00000000-0x03f00000, [0x0000eb78-0x03ed1000] available
>> entry=0x80008000, target=0x80008000
and the reply of Thomas,

I thought that the 0x80008000 (mapped to 0x00008000 with the MMU) address
refers to a non-available address (0x00008000 < 0x0000eb78).
Then, I tried to execute with "exec -t 0x81000000 0x81000000"... But nothing
more happened. Same pb.

Is it true that the "[0x0000eb78-0x03ed1000] available" means that outside
this range, we cannont access ?
What exactly correspond the "entry=0x80008000, target=0x80008000", and is it
possible to change it once for all ?

Thanks and regards,
Gilles.


---------- Original Message -----------
From: Gary Thomas <gary@mlbassoc.com>
To: gilles.bulthe@phelma.grenoble-inp.fr
Cc: ecos-discuss@ecos.sourceware.org
Sent: Tue, 09 Jun 2009 07:44:00 -0600
Subject: Re: [ECOS] Booting Linux from arm

> Gilles Bulthé wrote:
> > Hello,
> >
> > I have difficulties to boot Linux Kernel from my xm27 based platform, and am
> > wondering whether there is link with RedBoot or not.
> > My customized RedBoot starts as following :
> >
> > ----------- StartOfQuote-------------------------------------------
> >
> > ... Read from 0x03ee0000-0x03f00000 at 0xa0060000: .
> > ... Read from 0x03ed3000-0x03ed4000 at 0xa007f000: .
> > Turning on PMIC regulators: 1,2,3,4,5
> > Unrecognized chip: 0xf8!!!
> > hardware reset by WDOG
> >              
> > Clock input is 24 MHz
> > Booting from [NOR flash]
> >
> > RedBoot(tm) bootstrap and debug environment [ROMRAM] Non-certified release,
> > version FSL 200904 - built 16:22:29, May 22 2009
> >
> >
> > Platform: Freescale (i.MX27 )  PASS 1.0 [x32 DDR] Copyright (C) 2000, 2001,
> > 2002, 2003, 2004 Red Hat, Inc.
> > Copyright (C) 2003, 2004, 2005, 2006 eCosCentric Limited
> >
> >  
> > RAM: 0x00000000-0x03f00000, [0x0000eb78-0x03ed1000] available
> > FLASH: 0xa0000000 - 0xa4000000, 512 blocks of 0x00020000 bytes each.
> > RedBoot>
> > RedBoot> load -r -m xmodem -b 0x100000
> > CRaw file loaded 0x00100000-0x0028940f, assumed entry at 0x00100000 xyzModem -
> > CRC mode, 12585(SOH)/0(STX)/0(CAN) packets, 1 retries
> > RedBoot> exec
> > entry=0x80008000, target=0x80008000
> > Using base address 0x00100000 and length 0x00189410 Uncompressing
> >
Linux.........................................................................................................
> > done, booting the.
> >
> >
------------EndOfQuote-----------------------------------------------------------
> > and then, it stops.
> >
> >
> > I see "RAM: 0x00000000-0x03f00000, [0x0000eb78-0x03ed1000] available"
> >                -> why is not all the RAM available ?
>
> RedBoot uses the RAM which is listed as "not available"
>
> > And : "entry=0x80008000, target=0x80008000"
> >                -> this entry point 0x8008000 is then out of available range,
> > isn't it ? Is it possible to change it ?
>
> There are options to 'exec' for this.  Try 'help exec' :-)
>
> Also, the address '0x80008000' is a PHYSICAL address.  The addresses printed
> by RedBoot (available range, etc) are LOGICAL addresses - not the same.
>
> >
> > Regarding my ARM Linux sources and debugging with LED, I have notice that
> > Linux bugs from the moment when it "__turn_mmu_on". There may be a link.
> > I am now thinking that the MMU and the memory related lines quoted above may
> > have link, but do not really know how.
> >
> > If you have any idea about what's going on, it would be very helpfull !
> > Thank you in advance for reading me.
> > Gilles.
> >
>
> You really should ask these questions on the Linux-ARM lists, not here,
> as they have basically nothing to do with eCos/RedBoot.
>
> --
> ------------------------------------------------------------
> Gary Thomas                 |   Consulting for the
> MLB Associates              |     Embedded world
> ------------------------------------------------------------
------- End of Original Message -------


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