RAM installed vs reported

[Thanasis]

I have a netbook (Acer Aspire One A110L) and installed a 1GB DDR2 in the
available slot, for a total of 1.5GB or RAM.
The BIOS reports it as 1.5GB and so does grml linux (booting from usb),
but the installed gentoo linux reports only 904600 kB:

# free
             total       used       free     shared    buffers     cached
Mem:        904600      82316     822284          0       9752      37712
-/+ buffers/cache:      34852     869748
Swap:      1638588          0    1638588

# cat /proc/meminfo
MemTotal:         904600 kB
MemFree:          822284 kB
Buffers:            9752 kB
Cached:            37712 kB
SwapCached:            0 kB
Active:            32232 kB
Inactive:          28780 kB
Active(anon):      13848 kB
Inactive(anon):        0 kB
Active(file):      18384 kB
Inactive(file):    28780 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       1638588 kB
SwapFree:        1638588 kB
Dirty:                 4 kB
Writeback:             0 kB
AnonPages:         13548 kB
Mapped:            11256 kB
Shmem:               300 kB
Slab:              10356 kB
SReclaimable:       6132 kB
SUnreclaim:         4224 kB
KernelStack:        1424 kB
PageTables:          892 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2090888 kB
Committed_AS:      73552 kB
VmallocTotal:     122880 kB
VmallocUsed:        9688 kB
VmallocChunk:     109832 kB
DirectMap4k:       11832 kB
DirectMap4M:      905216 kB

I suspect it has to do with my kernel (2.6.32-gentoo-r1) configuration,
but do not know where to look.
Any suggestions ?


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