You're on the right track. The $row won't survive the loop, but the hash will, as it is declared outside the loop. 
my $base = $row->{'Base Addr. (Hex)'};
$reghash{$base}{'End Addr.'} = $row->{'End Addr.'}; 
# etc.

[download]

Your sample data seem to hint, though, that the Base Address is not always unique (F00000 appears 3 times). There can't be a duplicate key in a hash.

لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: read CSV file line by line and create hash table by choroba
in thread read CSV file line by line and create hash table by lshokri02

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