Warm reboot on 826x targets

[Frank]

--- Paul Gortmaker <p_gortmaker at yahoo.com> wrote:
> I've been trying to get a WRS 8265 to do a warm reboot, and
> found some
> things that I am wondering about.
> 
> Firstly, is anyone having success on having "reboot" restart
> the machine
> on a similar platform?
> 
> Secondly, the default BOOTROM_RESTART_ADDR is 0x40000104
> (sbc82xx.h) and I
> was wondering if this matches any platforms out there.  On
> this board, the
> place where U-Boot lives is 0xFFF00104 -- and I've verified
> this by typing
> "g fff00104" at the U-Boot prompt which causes U-Boot to
> simply restart.
> 
> I've changed the value in sbc82xx.h and now at the reboot,
> instead of a
> register dump, it simply hangs.  Looking at m8260_gorom (in
> kernel/head.S)
> it clears the MSR_EE (ext int. enable) bit in the MSR before
> jumping --
> but I was wondering if there are other bits in MSR that need
> to be
> cleared; e.g. instruction relocation enable and data
> relocation enable
> (MSR_IR and MSR_DR). The register bits are on p76 of
> MPCFPE32B.pdf from
> Freescale.
> 
> I guess if somebody even said "it works for me" then I'd have
> a better
> feeling thinking that what is done to the MSR currently is
> sufficient.
> 
> Paul.
> 
I'm working on the exact same problem with u-boot (trying to do
warm reboot from the VxWorks shell). I modified romInit.S to
pass control to u-boot (at 0xfe000000) and that works just fine.
But after I boot VxWorks from u-boot (go 0xfff00100) and invoke
reboot from the VxWorks shell, it just hangs. If I boot VxWorks
without invoking u-boot first, it works fine. If you find the
problem befor me, let me know and I'll do tha same...

> 
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