AM623: TI: AM62x QSPI boot mode fails

Muhammadh Salih

Part Number: AM623

Tool/software:

Hi,

We are using TI-AM62x-LP processor with Linux SDK (ti-processor-sdk-linux-am62xx-evm-11.00.09.04). We are having custom hardware with the boot mode settings of QSPI and UART as fallback.

Below is our Boot mode configuration:

At initial, we are booting the system via UART mode and flashing the U-boot binaries into the QSPI NOR flash from USB using below commands:

=> sf probe; sf erase 0x0 0x2000000

=> usb reset;fatload usb ${usbdev} ${loadaddr} tiboot3.bin

=> sf update $loadaddr 0x0 $filesize

=> fatload usb ${usbdev} ${loadaddr} tispl.bin

=> sf update $loadaddr 0x80000 $filesize

=> fatload usb ${usbdev} ${loadaddr} u-boot.img

=> sf update $loadaddr 0x280000 $filesize

=> reset

After the successful programming of U-boot into QSPI NOR flash, we are resetting the board. Expected to boot it from QSPI but its again fallback into the UART mode.

For a workaround we shortened the one resistor only once, then it started botting from QSPI in further power cycles.

But this workaround was working only in few boards and some of the boards, this workaround is not executing. Please give your inputs on the same.

25 days ago

0 Stanislav Stilyanov 25 days ago

TI__Mastermind 18400 points

Hi Muhammadh,

I can see you accidentally reversed the crystal settings.

Your settings: [2:0] = 110

TRM 25 MHz settings [2:0] = 011

Please try with the TRM settings and let me know if this helped.

Thanks,

Stan

0 Muhammadh Salih 24 days ago in reply to Stanislav Stilyanov

Intellectual 320 points

We did this changes already in our board. Still issue exists. Please provide the inputs on the same

0 Stanislav Stilyanov 24 days ago in reply to Muhammadh Salih

TI__Mastermind 18400 points

Muhammadh,

What is your QSPI memory part number?

0 Muhammadh Salih 24 days ago in reply to Stanislav Stilyanov

Intellectual 320 points

HI Stanislav Stilyanov

Below is the part number of it. We are having 32MB of size.

0 Stanislav Stilyanov 21 days ago in reply to Muhammadh Salih

TI__Mastermind 18400 points

Hi Muhammadh,

Some QSPI memory devices in very small packages are shipped with option 'Standard SPI with /WP and /HOLD pins'. To switch to 'Quad IO mode', user needs to program a bit named 'QE' or 'QUAD' in this chip as shown below. It is a one time procedure and from then on, ROM should be able to boot in QSPI mode. Currently only Standard SPI boot can be supported by ROM selected via BOOTMODE switches.

Regards,

Stan

0 Muhammadh Salih 20 days ago in reply to Stanislav Stilyanov

Intellectual 320 points

Hi Stan,

Thanks for your inputs. But how and where can I read this? Can you provide the commands for U-boot or Linux?

Regards,
Salih

0 Vaibhav Kumar 20 days ago in reply to Muhammadh Salih

TI__Mastermind 45646 points

Hi,

I have read through this thread. Here is a summary of what I have understood so far. Please correct my understanding if needed.

QSPI NOR Flash used: S25FL256SA

Primary Bootmode: QSPI

Fallback Bootmode: UART

Commands executed so far:

Erased flash 32 MB.
Load tiboot3.bin at 0x0 offset.
Load tispl.bin at 0x80000.
Load u-boot.img at 0x280000
Reset to boot from QSPI NOR.

I see your question on how to read the QUAD Enable bit value.

So the QE bit is located at bit 1 of the Configuration Register 1 as seen from the flash's datasheet.

Please run the following set of commands and let me know the value:

sf probe -> to probe the flash
sf read 0x82000000 0x0 0x2 -> Read first two bytes (status + config)
md.b 0x82000000 2 -> This will dump two bytes, byte[0] = Status Register 1 and byte[1] = Configuration Register 1.

Looking forward to the values.

Thanks,

Vaibhav

0 Vaibhav Kumar 20 days ago in reply to Vaibhav Kumar

TI__Mastermind 45646 points

FYI, attaching the flash datasheet for anyone going through this thread: www.infineon.com/.../infineon-s25fl128s-s25fl256s-128-mb-16-mb-256-mb-32-mb-fl-s-flash-spi-multi-io-3-v-datasheet-en.pdf

0 Muhammadh Salih 19 days ago in reply to Vaibhav Kumar

Intellectual 320 points

Above is the output. Looks like that bit is set already. But still while resetting the board, again its going into UART mode only.
As I mentioned earlier, shorting the resistor (DNP) working in some of my boards.

Please provide the solution on the same.

Regards,
Salih

0 Vaibhav Kumar 18 days ago in reply to Muhammadh Salih

TI__Mastermind 45646 points

Hi,

As per the logs, I do see that configuration register value is 0x82 which means QE bit is set.

But I also see status register 1 value as 0x30, which means from the flash datasheet that the block protect bit is enabled and there is erase failure.

0x30 corresponds to bit 4 and bit 5 set to value of 1, and from the status register 1 description of flash, this is what we see:

Can we please perform the following set of experiments?

The board on which you are able to boot in QSPI, please take one of them and read the status and configuration register in a similar fashion you did for the failing board.
The values from the board which boots successfully will tell us the root cause here.

Looking forward to your response.

Thanks,

Vaibhav

Processors

Processors forum

AM623: TI: AM62x QSPI boot mode fails