[U-Boot-Users] [PATCH] MPC8360EMDS lowboot option

[U-Boot-Users] [PATCH] MPC8360EMDS lowboot option

[Jerry Van Baren]

Hi Dave Liu,

The following patch adds a configuration to do "low boot" (HRCW.BMS = 0) 
as well as "high boot" (HRCW.BMS = 1).

Many people, myself included :o) prefer to boot out of low memory.  It 
has an added benefit that, if you screw up the image of of u-boot in low 
memory, you can switch SW9.3 FCFG and boot using the BCSR, which "high 
boots" (assuming you smart enough to keep a valid u-boot image at 
0xFFF00000).

The patch is against the top of the denx.de repository (thanks, 
Wolfgang, for pulling the fsl patches).

gvb
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[U-Boot-Users] [PATCH] MPC8360EMDS lowboot option

[Dave Liu]

On Thu, 2006-11-30 at 22:45 -0500, Jerry Van Baren wrote:
> Hi Dave Liu,
> 
> The following patch adds a configuration to do "low boot" (HRCW.BMS = 0) 
> as well as "high boot" (HRCW.BMS = 1).
> 
> Many people, myself included :o) prefer to boot out of low memory.  It 
> has an added benefit that, if you screw up the image of of u-boot in low 
> memory, you can switch SW9.3 FCFG and boot using the BCSR, which "high 
> boots" (assuming you smart enough to keep a valid u-boot image at 
> 0xFFF00000).

The 8360EMDS u-boot is booting at low memory in default now. You can
change it for high memory. 

> The patch is against the top of the denx.de repository (thanks, 
> Wolfgang, for pulling the fsl patches).

Thanks Wolfgang and Stefan for pulling them.

[U-Boot-Users] [PATCH] MPC8360EMDS lowboot option

[Jerry Van Baren]

Dave Liu wrote:
> On Thu, 2006-11-30 at 22:45 -0500, Jerry Van Baren wrote:
>> Hi Dave Liu,
>>
>> The following patch adds a configuration to do "low boot" (HRCW.BMS = 0) 
>> as well as "high boot" (HRCW.BMS = 1).
>>
>> Many people, myself included :o) prefer to boot out of low memory.  It 
>> has an added benefit that, if you screw up the image of of u-boot in low 
>> memory, you can switch SW9.3 FCFG and boot using the BCSR, which "high 
>> boots" (assuming you smart enough to keep a valid u-boot image at 
>> 0xFFF00000).
> 
> The 8360EMDS u-boot is booting at low memory in default now. You can
> change it for high memory. 
> 
>> The patch is against the top of the denx.de repository (thanks, 
>> Wolfgang, for pulling the fsl patches).
> 
> Thanks Wolfgang and Stefan for pulling them.

Yes, if the board is not configured as a PCI slave.  I forgot to ask, is 
that a hardware restriction or is it OK to "boot low" as a PCI slave 
(mostly curious)?

In defense of the patch, it is nice to be able to easily configure 
u-boot to boot high or low.  The Makefile configuration trick is really 
handy and is how several boards handle it.

Thanks,
gvb

[U-Boot-Users] [PATCH] MPC8360EMDS lowboot option

[Kumar Gala]

On Nov 30, 2006, at 10:26 PM, Jerry Van Baren wrote:

> Dave Liu wrote:
>> On Thu, 2006-11-30 at 22:45 -0500, Jerry Van Baren wrote:
>>> Hi Dave Liu,
>>>
>>> The following patch adds a configuration to do "low  
>>> boot" (HRCW.BMS = 0)
>>> as well as "high boot" (HRCW.BMS = 1).
>>>
>>> Many people, myself included :o) prefer to boot out of low  
>>> memory.  It
>>> has an added benefit that, if you screw up the image of of u-boot  
>>> in low
>>> memory, you can switch SW9.3 FCFG and boot using the BCSR, which  
>>> "high
>>> boots" (assuming you smart enough to keep a valid u-boot image at
>>> 0xFFF00000).
>>
>> The 8360EMDS u-boot is booting at low memory in default now. You can
>> change it for high memory.
>>
>>> The patch is against the top of the denx.de repository (thanks,
>>> Wolfgang, for pulling the fsl patches).
>>
>> Thanks Wolfgang and Stefan for pulling them.
>
> Yes, if the board is not configured as a PCI slave.  I forgot to  
> ask, is
> that a hardware restriction or is it OK to "boot low" as a PCI slave
> (mostly curious)?

You can boot low as a PCI slave, no HW restriction.

- k