From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tolunay Orkun <listmember@orkun.us>
Date: Wed, 26 Apr 2006 18:25:13 -0500
Subject: [U-Boot-Users] How do you test a bit set/clear from U-Boot command
 line/script?
In-Reply-To: <20060426222044.CA140353DAD@atlas.denx.de>
References: <20060426222044.CA140353DAD@atlas.denx.de>
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To: u-boot@lists.denx.de

Wolfgang Denk wrote:
> In message <444FDD08.2010101@orkun.us> you wrote:
>   
>> I know I can compare a simple value using itest command. e.g.
>>
>> itest *4000 -eq 1234 && echo 'Addr 4000 contains 1234'
>>
>> Now my problem is how can I test a bit of 32 bit quantity (say bit 4) 
>> stored at location 4000? This is a question about general hush/u-boot 
>> shell capability? It is a generic question...
>>     
>
> At the moment there is  no  command  that  implements  this.  As  you
> probaly  are aware, the "itest" command just implements the following
> operations:
>   
I did hope there was some clever way to do this using existing commands.

> Feel free to add new commands for AND, OR, and XOR...
>   
I will send a patch. I am not sure how OR or XOR could be useful 
though... We do not support multiple operations or store computed 
expression results anywhere.


Tolunay