[ECOS] RE: Problems with kernel booting.

["Patrick Doyle" <wpd at delcomsys dot com>]

I am Cc'ing the eCos-discuss list for this since I know there are folks
there who are playing with RedBoot on the ixp425.  I am not too sure how
much I can help you, since I don't know anything about the device.

It is possible that you don't need to use the "exec" command, but now that I
think about it some more, I don't think it is likely.  (In addition to
shutting down the MMU, the "exec" command also loads up the registers and
the tagged parameters list the way that the ARM-Linux kernel likes to see
them at boot, something that the "go" command does not do.)

It may be as simple as enabling CYGBLD_BUILD_REDBOOT_WITH_EXEC in your
ecos.ecc file (for your version of RedBoot) and making sure that the CDL
file for the ixp425 HAL sets sane values for
CYGHWR_REDBOOT_ARM_LINUX_EXEC_ADDRESS_DEFAULT and
CYGHWR_REDBOOT_ARM_TRAMPOLINE_ADDRESS.

It might be even easier than all that, perhaps all you need to do is to
define HAL_PLATFORM_MACHINE_TYPE appropriately in the ixp425 HAL file.

Or, you could ask Intel.

--wpd


> -----Original Message-----
> From: lucbolo@excite.it [mailto:lucbolo@excite.it]
> Sent: Thursday, February 13, 2003 7:07 AM
> To: Patrick Doyle
> Cc: linux-arm-kernel
> Subject: RE: Problems with kernel booting.
>
>
> Thanks Patrick,
> I guess you are right,and I need the exec command to launch Linux Kernel
> from Redboot.
> Unfortunately I haven't it, it doesn't show up when I type help
> at the Redboot
> prompt.
> How can I add support for it?
> At the moment I have a Redboot version downloaded from Intel web site and
> it supports ixp425 platform.
> On the contrary the standard Redboot version, downloaded from
> RedHat, supports
> exec command but it has nothing about ixp425.
> How can I mix the two versions?
> Do I have to handle cdl files?
> Thank you very much.
> Best regards Luca.
>
> >-- Messaggio Originale --
> >From: "Patrick Doyle" <wpd@delcomsys.com>
> >To: <lucbolo@excite.it>,
> >   "linux-arm-kernel" <linux-arm-kernel@lists.arm.linux.org.uk>
> >Subject: RE: Problems with kernel booting.
> >Date: Tue, 11 Feb 2003 14:48:51 -0500
> >
> >
> >I would suggest that you look at using the "exec" command in
> RedBoot instead
> >of the "go" command.  I don't know anything about the IXP425 platform,
> but,
> >if the eCos HAL for that platform enables the MMU then you will have to
> use
> >the "exec" command (which disables the MMU before branching to the code
> you
> >just loaded).
> >
> >As a hint, if the "exec" command shows up when you type "help" at the
> >RedBoot prompt, then you should probably use "exec".  If it doesn't, then
> >you will have to add support for it yourself (if the platform uses the
> MMU),
> >or you don't need it (if the platform does not use the MMU).
> >
> >One other possibility that I just thought of is to make sure that the
> >machine type is defined correctly for your platform.
> >
> >--wpd
> >
> >
> >> -----Original Message-----
> >> From: linux-arm-kernel-admin@lists.arm.linux.org.uk
> >> [mailto:linux-arm-kernel-admin@lists.arm.linux.org.uk]On Behalf Of
> >> lucbolo@excite.it
> >> Sent: Tuesday, February 11, 2003 3:56 AM
> >> To: linux-arm-kernel
> >> Subject: Problems with kernel booting.
> >>
> >>
> >> Hi,
> >> I'm working on IXP425 development platform (BIXMB425AD) and I'm trying
> >to
> >> port Linux on it.
> >> The kernel version I'm adopting is 2.4.19 patched with
> patch-2.4.19-rmk4
> >> and patch-2.4.19-rmk4-ds2.
> >> The problem I'm facing is soon after decompression when I get the
> >> following
> >> output:
> >> "Decompressing Linux............... done, booting the kernel."
> >> Then it hangs.
> >> My sequence of RedBoot commands is:
> >>
> >> load -r -v -b 0x11608000 zImage
> >> go 0x11608000
> >>
> >> and in Linux kernel configuration I've this line:
> >>
> >> console=ttyS0,115200 root=/dev/ram0 ip=192.168.110.55 initrd=0x18000000
> >> mem=64M@0x14000000
> >>
> >> Have you any idea about this problem?
> >> Thanks in advance,
> >> Luca
> >>
> >>
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> >>
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__________________________________________________________________
Accesso Internet Gratis per utenti Excite! Attivalo subito!
http://www.excite.it/hitech/accesso

Il Mio Excite. Personalizza la tua Home page Excite come vuoi tu!
http://www.excite.it

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