From: Parav Pandit <paravpandit@yahoo•com>
To: Milton Miller <miltonm@bga•com>,
cthomas@Soneticom•com, linuxppc-embedded@ozlabs•org
Subject: Re: Booting Linux Kernel without bootloader
Date: Tue, 1 Aug 2006 20:49:07 -0700 (PDT) [thread overview]
Message-ID: <20060802034907.22411.qmail@web36601.mail.mud.yahoo.com> (raw)
In-Reply-To: <11153922785140e0f761.861021530.miltonm@bga.com>
--- Milton Miller <miltonm@bga•com> wrote:
> On Tue Jul 25 2006 05:30:39 PM CDT, Clint Thomas
> wrote:
>
> > Basically, the system I want linux running on does
> not require the
> > initialization of hardware that U-boot provides,
> or at least it does not
> > need it to boot the linux kernel. I want to load
> an uncompressed linux
> > kernel into memory and start the execution of the
> kernel, without using
> > any kind of bootloader. Is this possible? Or does
> linux need some kind
> > of firmware or other software to tell it to start
> executing? Thanks for
> > any info you might have.
>
> To run a powerpc (not ppc, which will be removed)
> kernel, in addition to the uncompressed kernel you
> will need to supply a device tree structure, point
> r3 to it, zero r5, and set r4 to the load address
> (zero as you have described). See
> Documentation/powerpc/booting-without-of.txt for
> details. Then arrange for you processor to start
> executing at address 0. Note that /vmlinux has an
> elf header, you can use objcopy to remove it or
> adjust r4 and your start point; the kernel will copy
> itself to 0, clear bss and set up the stack. The
> device tree structure must be placed above the bss
> space in memory, not just the initialized data.
Linux kernel does the bss cleaning after
start_kernel() even though boot loader does it. So one
step less.
Parav
>
> milton
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs•org
>
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
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next prev parent reply other threads:[~2006-08-02 3:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-26 14:06 Booting Linux Kernel without bootloader Milton Miller
2006-08-02 3:49 ` Parav Pandit [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-08-03 18:02 Milton Miller
2006-08-03 7:48 Milton Miller
2006-08-03 14:34 ` Grant Likely
2006-08-03 16:27 ` Milton Miller
2006-08-03 16:34 ` Grant Likely
2006-08-03 16:49 ` David H. Lynch Jr.
2006-07-25 22:30 Clint Thomas
2006-07-25 23:38 ` bennett78
2006-07-26 6:15 ` Kalle Pokki
2006-07-26 10:45 ` Andrei Konovalov
2006-07-28 8:03 ` David H. Lynch Jr.
2006-07-28 14:02 ` bennett78
2006-08-02 4:17 ` Grant Likely
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