hw/xtensa/esp32s3: add sdmmc peripheral (QEMU-276)

[Throows]

Description

Hello, I added the SDMMC peripheral. This is just copy paste from the hw/xtensa/esp32.c.

Related

Fix for issue : #139.

Testing

no extensive test has been done. I only ran the sdmmc_card example program and it worked.

Here is the log output :

ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x4 (SPI_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce2820,len:0x1568
load:0x403c8700,len:0xf0c
load:0x403cb700,len:0x352c
entry 0x403c8a9c
I (37) boot: ESP-IDF v5.5.1 2nd stage bootloader
I (39) boot: compile time Sep 13 2025 17:54:54
I (39) boot: Multicore bootloader
I (48) boot: chip revision: v0.0
I (49) boot: efuse block revision: v0.0
I (51) boot.esp32s3: Boot SPI Speed : 80MHz
I (52) boot.esp32s3: SPI Mode       : SLOW READ
I (52) boot.esp32s3: SPI Flash Size : 2MB
(-- snip --)
I (215) app_init: Application information:
I (216) app_init: Project name:     sd_card
I (216) app_init: App version:      1
I (216) app_init: Compile time:     Sep 13 2025 17:54:49
I (216) app_init: ELF file SHA256:  491bd1e5e...
I (216) app_init: ESP-IDF:          v5.5.1
I (216) efuse_init: Min chip rev:     v0.0
I (216) efuse_init: Max chip rev:     v0.99 
I (216) efuse_init: Chip rev:         v0.0
(-- snip --)
I (235) main_task: Calling app_main()
I (235) example: Initializing SD card
I (235) example: Using SDMMC peripheral
I (235) example: Mounting filesystem
I (305) example: Filesystem mounted
Name: QEMU!
Type: SDSC
Speed: 160.00 MHz (limit: 20.00 MHz)
Size: 1MB
CSD: ver=1, sector_size=512, capacity=2048 read_bl_len=9
SSR: bus_width=4
I (315) example: Opening file /sdcard/hello.txt
I (345) example: File written
I (345) example: Renaming file /sdcard/hello.txt to /sdcard/foo.txt
I (355) example: Reading file /sdcard/foo.txt
I (355) example: Read from file: 'Hello QEMU!!'
I (355) example: Opening file /sdcard/nihao.txt
I (365) example: File written
I (365) example: Reading file /sdcard/nihao.txt
I (365) example: Read from file: 'Nihao QEMU!!'
I (365) example: Card unmounted
I (365) main_task: Returned from app_main()

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

Thanks
~Romain