From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tolunay Orkun <listmember@orkun.us>
Date: Wed, 26 Apr 2006 15:50:16 -0500
Subject: [U-Boot-Users] How do you test a bit set/clear from U-Boot command
 line/script?
In-Reply-To: <20060426200809.6BE30353DAE@atlas.denx.de>
References: <20060426200809.6BE30353DAE@atlas.denx.de>
Message-ID: <444FDD08.2010101@orkun.us>
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To: u-boot@lists.denx.de

Wolfgang Denk wrote:
> In message <444FD06D.4060309@orkun.us> you wrote:
>   
>> Within a u-boot script (to be executed by autoscr command), I need to 
>> read a GPIO port and if a particular GPIO bit is set execute some 
>> conditional commands. I am not sure how to do this with test/itest 
>> commands. Any ideas?
>>     
>
> This is obviously highly hardware specific.
>
>
>   

I am not asking anything about hardware. Forget I said GPIO. Let's say a 
value in general memory space. It could be in ram or flash....

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...

Best regards,
Tolunay