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If there is doubt that booting from SD card is failing, then as first step a special BOOT.bin should be used to verify the that Zynq Bootrom can load the boot code from SD Card at all. This special image does not use or initialize any PS peripherals including external DDR memory, it also does not attempt to configure the PL portion. The image simply Blinks a LED connected to some MIO pin. The same image can be used on any Zynq device, if the SD boot process succeeds at all then code in the image will be executing.
| Note |
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| Xilinx Zynq bootrom does support SD Spec ver1 Cards, but Xilinx FSBL does not. So very old SD Cards would not boot at all when using Xilinx supplied FSBL. |
SDIO MIO Pullups
If SDIO interface is connected to SD card via special purpose level shifter IC, then it maybe desirable or even necessary to disable MIO internal pullups for SDIO pins. Some SD Cards may fail when the SDIO MIO internal pullups are enabled.
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