[U-Boot] Variable content dump to memory

[U-Boot] Variable content dump to memory

[Nicolae Rosia]

Hello,

I'm trying to write the contents of a variable to a file using ext4write
but it requires a memory address as input.
Is there an easy way to get the contents of a variable to a particular mem
address?

Best regards,
Nicolae

[U-Boot] Variable content dump to memory

[James Chargin]

On 03/24/2016 03:30 AM, Nicolae Rosia wrote:
> Hello,
>
> I'm trying to write the contents of a variable to a file using ext4write
> but it requires a memory address as input.
> Is there an easy way to get the contents of a variable to a particular mem
> address?

You weren't completely specific about your needs, but assuming you are 
wanting to write a U-Boot environment variable to memory, try something like

=> # set up a test value
=> setenv var 12345678
=> printenv var
var=12345678
=>
=> # do the actual write
=> mw.l 80020000 $var 1
=>
=> # observe memory was set
=> md.l 8001fff0 c
8001fff0: 67ffedc4 dbc98df5 8e71cdd4 628fcacd    ...g......q....b
80020000: 12345678 a2fe8db5 df34c767 636dbd37    xV4.....g.4.7.mc
80020010: 375dfdcb fde86ca2 3f273cdf 1fe951f9    ..]7.l...<'?.Q..

Also, "help mw".

This was done on something similar to beaglebone x15. You will need to 
use memory addresses that are valid for your target system.

Jim

>
> Best regards,
> Nicolae
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-- 
Jim Chargin
AJA Video Systems                       jimc at aja.com
(530) 271-3334                          http://www.aja.com

[U-Boot] Variable content dump to memory

[Nicolae Rosia]

On Thu, Mar 24, 2016 at 7:51 PM, James Chargin <jimccrown@gmail.com> wrote:
[...]
> You weren't completely specific about your needs, but assuming you are wanting to write a U-Boot environment variable to memory, try something like
>
You're right.
I'm trying to do the following:
U-Boot# setenv mytext 'This is a long text'
U-Boot# printenv mytext
mytext=This is a long text
and somehow write it to a memory address so I can use it with ext4write.

Best regards,
Nicolae

[U-Boot] Variable content dump to memory

[James Chargin]

Dear Nicolae,

On 03/25/2016 02:12 AM, Nicolae Rosia wrote:
> On Thu, Mar 24, 2016 at 7:51 PM, James Chargin <jimccrown@gmail.com> wrote:
> [...]
>> You weren't completely specific about your needs, but assuming you are wanting to write a U-Boot environment variable to memory, try something like
>>
> You're right.
> I'm trying to do the following:
> U-Boot# setenv mytext 'This is a long text'
> U-Boot# printenv mytext
> mytext=This is a long text
> and somehow write it to a memory address so I can use it with ext4write.

I don't have a solution to your needs, unfortunately. I thought my 
solution might be for a problem more simple than you were asking about.

Perhaps someone else on the mailing list has an idea.

Jim

>
> Best regards,
> Nicolae
>

-- 
Jim Chargin
AJA Video Systems                       jimc at aja.com
(530) 271-3334                          http://www.aja.com