[U-Boot] non SPL boot on beagleboard-xm

[U-Boot] non SPL boot on beagleboard-xm

[Peter Meerwald]

Hello,

I can boot u-boot built from git commit 
b609009801b8a00644926f49b7d0d0cc0d3d8797 successfully, but it fails with 
git commit ee08a8260a3a7f6ef2001cfa3e7b6137b485f40a:

Texas Instruments X-Loader 1.5.1 (Jan 24 2012 - 14:51:45)
Beagle xM
Reading boot sector
Loading u-boot.bin from mmc

for commit ee08a8260a3a7f6ef2001cfa3e7b6137b485f40a I am disabling (or so 
I hope) SPL by setting
#define CONFIG_SPL -> #undef CONFIG_SPL
in include/configs/omap3_beagle.h

is SPL mandatory?
CONFIG_SPL does not work for me to disable it

note: using MLO/SPL with current u-boot works fine

thanks, p.

-- 

Peter Meerwald
+43-664-2444418 (mobile)

[U-Boot] non SPL boot on beagleboard-xm

[Tom Rini]

On Tue, Jan 24, 2012 at 10:02 AM, Peter Meerwald <pmeerw@pmeerw.net> wrote:
> Hello,
>
> I can boot u-boot built from git commit
> b609009801b8a00644926f49b7d0d0cc0d3d8797 successfully, but it fails with
> git commit ee08a8260a3a7f6ef2001cfa3e7b6137b485f40a:

The current implementation (after poking some of the other
beagleboard.org folks) requires SPL.  It's not a hard requirement of
supporting SPL that other loaders not be supported, we just didn't aim
for compatibility.

-- 
Tom

[U-Boot] non SPL boot on beagleboard-xm

[Peter Meerwald]

Hello Tom,

> > I can boot u-boot built from git commit
> > b609009801b8a00644926f49b7d0d0cc0d3d8797 successfully, but it fails with
> > git commit ee08a8260a3a7f6ef2001cfa3e7b6137b485f40a:

> The current implementation (after poking some of the other
> beagleboard.org folks) requires SPL.  It's not a hard requirement of
> supporting SPL that other loaders not be supported, we just didn't aim
> for compatibility.

thank you for the clarification; I had the impression it might be 
something optional as CONFIG_SPL implies

MLO/SPL + current u-boot breaks the USB ethernet patches (i.e. booting via 
tftp)

regards, p.

-- 

Peter Meerwald
+43-664-2444418 (mobile)

[U-Boot] non SPL boot on beagleboard-xm

[Tom Rini]

On 01/25/2012 03:03 AM, Peter Meerwald wrote:
> Hello Tom,
> 
>>> I can boot u-boot built from git commit
>>> b609009801b8a00644926f49b7d0d0cc0d3d8797 successfully, but it fails with
>>> git commit ee08a8260a3a7f6ef2001cfa3e7b6137b485f40a:
> 
>> The current implementation (after poking some of the other
>> beagleboard.org folks) requires SPL.  It's not a hard requirement of
>> supporting SPL that other loaders not be supported, we just didn't aim
>> for compatibility.
> 
> thank you for the clarification; I had the impression it might be 
> something optional as CONFIG_SPL implies
> 
> MLO/SPL + current u-boot breaks the USB ethernet patches (i.e. booting via 
> tftp)

Even with 'dc off' before you start usb?

-- 
Tom

[U-Boot] non SPL boot on beagleboard-xm

[Peter Meerwald]

Hello Tom,

> > MLO/SPL + current u-boot breaks the USB ethernet patches (i.e. booting via 
> > tftp)

> Even with 'dc off' before you start usb?

I was not aware of the u-boot command 'dc off' -- yes, it solve my USB 
ethernet problem

here is my story (from bisecting):

v2011.06 + Koen et al. patches (git://github.com/koenkooi/u-boot.git) 
works

shortly afterwards, dcache was enabled (commit 
c2dd0d45540397704de9b13287417d21049d34c6) and USB ethernet fails

v2011.09 works if using 'dc off' before 'usb start' (I tried it as a 
recent non-SPL u-boot version)

u-boot current (137703b811502dfea364650fb3e17f20b4c21333) works as well 
with 'dc off' before 'usb start'

thanks, regards, p.

-- 

Peter Meerwald
+43-664-2444418 (mobile)

[U-Boot] non SPL boot on beagleboard-xm

[Tom Rini]

On 01/25/2012 08:43 AM, Peter Meerwald wrote:
> Hello Tom,
> 
>>> MLO/SPL + current u-boot breaks the USB ethernet patches (i.e. booting via 
>>> tftp)
> 
>> Even with 'dc off' before you start usb?
> 
> I was not aware of the u-boot command 'dc off' -- yes, it solve my USB 
> ethernet problem
> 
> here is my story (from bisecting):
> 
> v2011.06 + Koen et al. patches (git://github.com/koenkooi/u-boot.git) 
> works
> 
> shortly afterwards, dcache was enabled (commit 
> c2dd0d45540397704de9b13287417d21049d34c6) and USB ethernet fails
> 
> v2011.09 works if using 'dc off' before 'usb start' (I tried it as a 
> recent non-SPL u-boot version)
> 
> u-boot current (137703b811502dfea364650fb3e17f20b4c21333) works as well 
> with 'dc off' before 'usb start'

So what's going on is that the dcache has been enabled now, but the USB
stack is not safe, so we have to issue 'dcache off' (or 'dc off') before
starting USB (or in other cases, networking).

-- 
Tom

[U-Boot] non SPL boot on beagleboard-xm

[Marek Vasut]

> On 01/25/2012 08:43 AM, Peter Meerwald wrote:
> > Hello Tom,
> > 
> >>> MLO/SPL + current u-boot breaks the USB ethernet patches (i.e. booting
> >>> via tftp)
> >> 
> >> Even with 'dc off' before you start usb?
> > 
> > I was not aware of the u-boot command 'dc off' -- yes, it solve my USB
> > ethernet problem
> > 
> > here is my story (from bisecting):
> > 
> > v2011.06 + Koen et al. patches (git://github.com/koenkooi/u-boot.git)
> > works
> > 
> > shortly afterwards, dcache was enabled (commit
> > c2dd0d45540397704de9b13287417d21049d34c6) and USB ethernet fails
> > 
> > v2011.09 works if using 'dc off' before 'usb start' (I tried it as a
> > recent non-SPL u-boot version)
> > 
> > u-boot current (137703b811502dfea364650fb3e17f20b4c21333) works as well
> > with 'dc off' before 'usb start'
> 
> So what's going on is that the dcache has been enabled now, but the USB
> stack is not safe, so we have to issue 'dcache off' (or 'dc off') before
> starting USB (or in other cases, networking).

Why would it not be safe? Because we don't have the unified cache ops in place 
yet? :-(

M