Memory size issue

[Alexander Shiyan]

 Hello.

I found a discrepancy between the size of memory in the system and report by meminfo .
In the following example, the system registered 512M , but the  meminfo shows only 256M.
Error or so and originally intended ?

barebox at i.MX51:/ devinfo mem0
resources:
num   : 0
name  : ram0
start : 0x90000000
size  : 0x20000000
driver: mem
bus: platform

no info available for mem0
no parameters available
barebox at i.MX51:/ meminfo
max system bytes =     245760
system bytes     =     245760
in use bytes     =     223200

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