T2081 SD card boot

[Ashok0999]

Hi,

We have a custom board using T2081. We are trying to bring up the board using SD card. As given in document, we prepared the SD card with RCW, uboot-spl and u-boot. We are unable to progress because what we think SD card is not responding. We see activity on CMD line but not much beyond that. In order to debug this we plan to run uboot-spl in SRAM and the full u-boot from SD card. Can you let us know how to do this especially u-boot-spl from SRAM. We searched various forums and documents, but we did not get enough information.

[yipingwang]

First, please configure the target board fetching RCW from SD card.

Then use CodeWarrior to create a SRAM project and check whether this CodeWarrior SRAM project can run successfully.

Use this method, you can verify whether RCW deployed in SD card is correct.

[Ashok0999]

Hii Yipingwang,

I’m currently working on configuring my target board to fetch the RCW from an SD card. I’ve successfully created a SRAM project in CodeWarrior, and it runs without issues. However, I’m having trouble when attempting to boot from the SD card.

after buffer we placed a pullup resistor on sd_clk with 10k(resistor value)

Observations:
I inserted the SD card into the board and monitored the sd_clk line before and after the buffer, as well as the sd_data0 line.
Here are the details of the buffer I’m using: Part Number: MAX13035EETE+T.

for your reference below i am attaching images

is there any modifications needed please suggest.

[Ashok0999]

Hii Yipingwang,

below attached image  is of schematics,
connecting buffer to SD card .

[yipingwang · Accepted solution]

If configuring the target board to fetch RCW from SD card first, then run CodeWarrior SRAM project successfully(without using JTAG configuration file overriding RCW function), it means there is no problem to fetch RCW from SD card now.

Probably you need to use CodeWarrior to debug SD u-boot, please refer to the following application note.

https://community.nxp.com/t5/CodeWarrior-Development-Tools/CodeWarrior-U-Boot-Debugging/ta-p/1121398