Tested with a RPi2 piCore 6.1 (armv7 architecture):
$ tce-load -wi kmaps
Downloading: kmaps.tcz
Connecting to repo.tinycorelinux.net (89.22.99.37:80)
wget: server returned error: HTTP/1.1 404 Not Found
md5sum: kmaps.tcz.md5.txt: No such file or directory
Error on kmaps.tcz
I had to manually download this tcz from the x86 arch repository and install it locally to be able to change the layout of my keyboard:
$ wget http://tinycorelinux.net/6.x/x86/tcz/kmaps.tcz
$ tce-load -i kmaps
$ sudo loadkmap < /usr/share/kmap/qwerty/es.kmap