Fatal exception when upgrading from SDK 1.5.4.1 to 3.0.6

[przemyslawzygmunt]

After upgrading from version 1.5.4.1 (39cb9a32) to version 3.0.6-dev (865fa65) the firmware crashes before entering user_init. This issue does not occur when upgrading from 1.5.4.1 (39cb9a32) to 3.0.5-dev (81bde69). The problem also does not occur when the update flow is as follows: 1.5.4.1 -> 3.0.5 -> 3.0.6. In the event of a fatal exception, the only solution is to go back from 3.0.6 to a lower version and only then can you upgrade to 3.0.6. Unfortunately, if the user uses OTA, he stays with a dead device.

Uart Log:
load 0x40100000, len 1856, room 16
tail 0
chksum 0x63
load 0x3ffe8000, len 776, room 8
tail 0
chksum 0x02
load 0x3ffe8310, len 552, room 8
tail 0
chksum 0x79
csum 0x79

2nd boot version : 1.5
  SPI Speed      : 40MHz
  SPI Mode       : DIO
  SPI Flash Size & Map: 16Mbit(1024KB+1024KB)
jump to run user1 @ 1000

Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
epc1=0x4000bf64, epc2=0x00000000, epc3=0x00000000, excvaddr=0x4024d293, depc=0x00000000
Fatal exception (3):
.........