“pata-gpio is a Linux kernel driver for GPIO bitbanged PATA (also known as ATA/ATAPI or IDE).
Pin configuration can be set via device tree, the regular ATA framework is used.
IDE Primary/Secondary device support is implemented.
Performance
On a Raspberry Pi 4 (with direct GPIO) about 800 KiB/s reading, 500 KiB/s writing speed is possible. Most of the performance bottleneck is down to the usage of libgpiod (kernel gpio abstraction), which is optimized for tasks like switching LEDs. Data transmission is well outside the design scope of libgpiod.
DMA and interrupts are not implemented at the moment.”