[U-Boot-Users] u-boot as second monitor

[U-Boot-Users] u-boot as second monitor

[Francisco Afonso]

Hi,

I have a TQM823L board that comes with the Mon8xx monitor. I have read 
about how to install uboot over Mon8xx, but I would like to know if it 
is possible to generate u-boot  for a different flash address and call 
it after the Mon8xx boot. If so what should I change in the uboot code?

Thanks,

Francisco

[U-Boot-Users] u-boot as second monitor

[Timur Tabi]

Francisco Afonso wrote:
> Hi,
> 
> I have a TQM823L board that comes with the Mon8xx monitor. I have read 
> about how to install uboot over Mon8xx, but I would like to know if it 
> is possible to generate u-boot  for a different flash address and call 

Yes, that's possible.

> it after the Mon8xx boot. If so what should I change in the uboot code?

One problem is if Mon8xx initializes the hardware before calling U-Boot. 
U-Boot may not work if some hardware is already initialized before U-Boot 
starts.  I have this problem with my BDI-2000 hardware debugger.  If I let the 
BDI initialize flash (so that I can write to it), U-Boot will hang when it starts.

-- 
Timur Tabi
Linux Kernel Developer @ Freescale

[U-Boot-Users] u-boot as second monitor

[Wolfgang Denk]

In message <4550B8CB.2010809@freescale.com> you wrote:
>
> > I have a TQM823L board that comes with the Mon8xx monitor. I have read 
> > about how to install uboot over Mon8xx, but I would like to know if it 
> > is possible to generate u-boot  for a different flash address and call 
> 
> Yes, that's possible.

This is NOT a supported mode of operation.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
The human mind  ordinarily  operates  at  only  ten  percent  of  its
capacity. The rest is overhead for the operating system.

[U-Boot-Users] u-boot as second monitor

[Wolfgang Denk]

In message <4550A211.9070706@dei.uminho.pt> you wrote:
> 
> I have a TQM823L board that comes with the Mon8xx monitor. I have read 
> about how to install uboot over Mon8xx, but I would like to know if it 
> is possible to generate u-boot  for a different flash address and call 
> it after the Mon8xx boot. If so what should I change in the uboot code?

No, this is not possible. There is no reason  to  keep  MON8xx  after
installing U-Boot anyway. You won't ever need or want it again.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"If you'll excuse me a minute, I'm going to have a cup of coffee."
- broadcast from Apollo 11's LEM, "Eagle", to Johnson  Space  Center,
Houston July 20, 1969, 7:27 P.M.

[U-Boot-Users] u-boot as second monitor

[Ulf Samuelsson]

Wolfgang Denk skrev:
> In message <4550A211.9070706@dei.uminho.pt> you wrote:
>> I have a TQM823L board that comes with the Mon8xx monitor. I have read 
>> about how to install uboot over Mon8xx, but I would like to know if it 
>> is possible to generate u-boot  for a different flash address and call 
>> it after the Mon8xx boot. If so what should I change in the uboot code?
> 
> No, this is not possible. There is no reason  to  keep  MON8xx  after
> installing U-Boot anyway. You won't ever need or want it again.
> 

It is possible, This is how you boot the AT91RM9200 from dataflash.

First the bootROM is executed and this loads "Dataflashboot.bin" into
internal SRAM and jumps to the beginning.
Dataflashboot.bin loads U-Boot into SDRAM and jumps into U-boot.
And no, you cannot replace Dataflashboot.bin with U-boot
(unless you manage to shrink it to 12 kByte)

The at91rm9200dk needs a little tweaking for this to work.
Cannot link it to 0x00000000.

/Ulf


> Best regards,
> 
> Wolfgang Denk
> 

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