BOOTING From SD Card

[mark]

Hello OSD335x-BAS Forum

We are having a problem with the OSD335x BAS with booting from the SD Card

The system boot pins are confirmed to be 0x4018

With a Scope or Logic Analyzer we observe the OSD335x communicating with the SD Card

we observe the SD’s CMD and CLK and DAT0 showing activity as expected

But

the SD card is not switching to 4 Bit Wide DAT0,DAT1,Dat2,Dat3

The SD image we are using is from a Pocket Beagle that boots for years without a problem

I read about the EEPROM and Board ID issue.   My impression is that this is only accessed after a successful boot

Looking forward to your most precious feedback

[mark]

EEPROM Status from Factory OSD335x-BAS

does the EEPROM need to be programmed before the OSD335x-BAS will boot from an SD Card ?

[Neeraj Dantu]

mark,

EEPROM ID is needed for successful boot beyond SPL(1st stage bootloader). Without the ID, it appears like there is no activity on UART0(console) because debug header print is disabled in the SPL. Please see https://octavosystems.com/app_notes/osd335x-eeprom-during-boot/ for help on programming the EEPROM and booting the board into u-boot.

Also, see https://github.com/RobertCNelson/omap-image-builder/tree/master/octavo#generate-image-file for building custom images.

Best,
Neeraj

[Author]

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