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Total Ram size is less than total Ram allocated to EVM OMAPL137

Hi, I have a query regarding the total amount of ram available to EVM OMAPL137 during runtime of Linux but according to the Uboot command " bootargs mem=32M " I have allocated 32MB of ram to the EVM OMAPL137 but during runtime when I run " free " command on Linux it displays that 28.3 MB is the total ram size of the device. Can anyone provide me solution that why it is only considering 28.3MB of ram instead of 32MB. Thanks & Regards Jitendra