tree 044770d229f62e24132990e5cc32baf4ab20a5d8
parent 68968901e79f91a2516ffa091959d0378526f838
author Marek Vasut <marex@denx.de> 1407109629 +0200
committer Stefano Babic <sbabic@denx.de> 1408530117 +0200

ARM: mx6: Prevent overflow in DRAM size detection

The MX6 DRAM controller can be configured to handle 4GiB of DRAM, but
only 3840 MiB of that can be really used. In case the controller is
configured to operate a 4GiB module, the imx_ddr_size() function will
correctly compute that there is 4GiB of DRAM in the system. Firstly,
the return value is 32-bit, so the function will effectively return
zero. Secondly, the MX6 cannot address the full 4GiB, but only 3840MiB
of all that. Thus, clamp the returned size to 3840MiB in such case.

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Tim Harvey <tharvey@gateworks.com>