I just pushed a patch with the test changes for this to my local repo:  https://github.com/5kft/build/commit/b75929e99f67a5d628bc031a1c4e73ab287c7df7.  This patch is against the "sunxi-current" target.    I can make a PR for this change, but again I don't have an H6 board to test any of this on, and I'd rather not do a PR until we know it works.  Also, I'm not sure what the appropriate critical temperature is for the H6, so in this patch I left it at 105C just like for the H3/H5.