The generator matrix

 1  0  1  1  1  1  1  1
 0  1  1  a a^6*X+a^2 a^3 a^6*X+a^4 a^5
 0  0 a^6*X a*X a^3*X a^5*X  X a^2*X

generates a code of length 8 over F8[X]/(X^2) who´s minimum homogenous weight is 48.

Homogenous weight enumerator: w(x)=1x^0+196x^48+3584x^49+3696x^56+25088x^57+203x^64

The gray image is a linear code over GF(8) with n=64, k=5 and d=48.
This code was found by Heurico 1.16 in 0.00811 seconds.