AM2612: Flash memory

Part Number: AM2612
Other Parts Discussed in Thread: AM261-SOM-EVM

Hi TI team,

We are going to use AM2612AOFFHMZCZR for one of our safey applicaion. We have an issue with the flash for boot. The existing flash memeory for boot in the supporting developmnent board AM261-SOM-EVM is IS25LX256-LHLE. But there is no stock fo this NOR flash. We have tight timline of schematic and PCB completion. So here my question are
1. can we use another NOR flash memory for booting. 

2. If yes, then any QSPI we can use?

3. Or There is any specific requirement of NOR flash with the AM2612AOFFHMZCZR.

4. If we can use any QSPI supporting NOR flash then the existing SDK for flash need to change little bit or more? 

5. If we need to change existing SDK for new NOR QSPI flash memory then what are the things we need to change? 

6. if you could suggest another NOR flash memory with existing SDK or little bit chage in SDK with available stock, then you are welcome.