BL2 memory map:

00100200 - 00100203 (000004)  : Flag of debugger hook for RAM boot

40100000 - 401fffff (100000)  : Scratch buffer for mtk-qspi/mtk-snand driver
40400000 - 407fffff (400000)  : Scratch buffer for UBI/NMBM/RAM-load
40800000 - 40bfffff (400000)  : FIP XZ decompression buffer
41000000 - 41dfffff (e00000)  : Block device buffer
41e00000 -                    : BL33