AM2612: QSPI BSL Load on Custom Board

Part Number: AM2612
Other Parts Discussed in Thread: UNIFLASH

I'm working with a customer using a custom designed board.

1. I can provide a schematic privately.
2. Saleae logic trace can be provided privately
3. QSPI FLASH is IS25LP256D-RHLE.
   1. Meets the requirements according to our guide.
4. MCU SDK version 10.02.00.15.
5. SBL is OSPI, modified based on SDK example.
   1. Yes, we know that this is no longer supported in favor of OSPI Multicore Elf in the latest SDK.
6. CCS 20.4.0.
7. SBL FLASH'd with Uniflash tool.

The SPL does not appear to be successfully loaded by the bootrom. The intent has been to debug the SBL using the instructions found here.

When this proved unsuccessful, we decided to put the QSPI lines on a logic analyzer for some additional insight into what might be going wrong. We see the following sequence of events:

1. Single CMD 0x9F product identification read.
   1. 1S mode
   2. Clock frequency 6.25MHz
   3. Repsonse 0x9D 0x60 0x19 0x9D (expected)
2. 16x CMD 0x9F product identification reads.
   1. 1S mode
   2. Clock frequency 50MHz
   3. Response 0x9D 0x60 0x19 0x9D (expected)
3. ~50us gap
4. Single CMD 0x6B fast read quad.
   1. 4s mode
   2. Clock frequency 50MHz
   3. 3-byte address 0x000000
   4. 1-byte dummy
   5. Response (4s mode) 0xEEEE 0xEEEE 0xEEEE 0xEEEE
5. ~60us gap
6. Repeat steps 1 through 5 again, four times in total, after which point there is no more traffic.

We are a bit stumped on what might be happening and next steps. We are looking for advisement.

Thanks,

Stuart