Hi g.f.,
1. The RBL does not check the code/data that is loaded against the code/data in the NOR Flash to verify that it matches correctly.
2. The jump from PG 1.0 to PG 2.0 was due to PLL initialization issues. The source that is provided here: http://software-dl.ti.com/sdoemb/sdoemb_public_sw/rbl/1_0_C6670/index_FDS.html should be unchanged for SPI NOR.
There are currently no plans to release PG 2.0 boot ROM source.
Hope this helps.
Regards,
-Jon