The newest SINIT code required a bios upgrade on my Q77M-D2H motherboard.
With the new bios, I am getting a hang either after MTRR registers are set, or after GETSEC[SENTER].
I slowed down the boot using a busy-wait in printk, and if the boot is slow enough, GETSEC[SENTER] is never written to the console.
However, with a slightly faster boot, the hang is after GETSEC[SENTER].
Here are some videos from the boot (faster and slower).