DDR tuning fails Bit Deskew and Eye Training I'm DDR tuning a custom STM32MP157F board with 4GB DDR3. All DDR tests are passing however I get the following tuning failure for Bit Deskew: Failed [Cannot Deskew lines, there is no PASS region] and Eye Training: [Cannot DQS timings, there is no PASS region]What exactly does this mean? How can it fail tuning but pass testing?DDR>test 0
...
loop 1: 0/17 test failed
Result: Pass [loop 1: 17 tests passed]
DDR>tuning 1
execute 1:Bit de-skew
Result: Failed [Cannot Deskew lines, there is no PASS region]
Result: Failed [Cannot Deskew lines, there is no PASS region]
Result: Failed [error = 2]
DDR>tuning 2
execute 2:Eye Training
Result: Failed [Cannot DQS timings, there is no PASS region]
Byte 1, DQS unit = 3, phase = 3
Result: Failed [error = 1]
DDR>tuning 3
execute 3:Display registers
Byte 0 Dekew result, bit0 delay, bit1 delay...bit8 delay
2 2 2 2 2 2 2 2
dxndllcr: [5a0041cc] val:400a0000
dxnqdstr: [5a0041d4] val:3db02001
dxndqtr: [5a0041d0] val:aaaaaaaa
Byte 1 Dek
