eMMC connection problem

[PoleG97]

Hello everyone,

I've been working with an ESP32-S3 N8R2 and an eMMC memory chip (specifically, the IS21ES08G from ISSI: [datasheet link](https://www.issi.com/WW/pdf/IS21_22ES08G.pdf)), but I'm running into an issue when trying to initialise and use the eMMC from my application.

The connection schematic is shown in the attached images. For the software, I'm using the eMMC example provided in the ESP-IDF. After configuring the correct GPIOs in the example, the application compiles and flashes correctly, but I'm getting the following output on the monitor log:

```
[Full ESP-IDF boot and log output, including the following key error:]
E (3370) sdmmc_common: sdmmc_init_ocr: send_op_cond (1) returned 0x107
E (3370) vfs_fat_sdmmc: sdmmc_card_init failed (0x107).
...
E (3390) example: Failed to initialize the eMMC (ESP_ERR_TIMEOUT). Make sure eMMC lines have pull-up resistors in place.
```

I'm unsure whether this is a hardware design issue, something missing in my `menuconfig`, or a configuration oversight elsewhere. According to the documentation, the ESP32-S3 supports the eMMC version used by this ISSI chip, so I'm a bit stuck trying to figure out what’s going wrong.

Any suggestions or guidance would be greatly appreciated!

Best regards,
Jairo