The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1  1  1  2  1  2  1  1  1  1  1  1  1
 0  1  1  a 3a^2+2 2a^2+3a+1 a^2+3a a^2+3a+3 3a^2+2a+3  0 2a^2+3  a 3a^2+2 a^2+3a 3a^2+2a+3 2a^2+3a+1 a^2+3a+3  1  2 3a^2+3 a+2 a^2+3a+1  1 2a^2+2a+1  2 3a^2+2a 2a^2+3a+3 a^2+a  2 2a^2+2a+3 a+2 3a^2+2a+2
 0  0 2a^2+2 2a  2  0 2a+2 2a^2+2a+2 2a^2+2a 2a^2 2a 2a^2+2a 2a+2  2 2a^2+2 2a^2+2a+2 2a^2 2a 2a^2+2 2a 2a^2+2a+2  0 2a^2+2 2a+2 2a^2+2a 2a^2+2a  2 2a^2 2a^2+2a+2 2a^2  2  0

generates a code of length 32 over GR(64,4) who´s minimum homogenous weight is 212.

Homogenous weight enumerator: w(x)=1x^0+1680x^212+2240x^213+196x^216+5600x^220+4480x^221+252x^224+10640x^228+7616x^229+28x^248+35x^256

The gray image is a code over GF(8) with n=256, k=5 and d=212.
This code was found by Heurico 1.16 in 0.104 seconds.