Sec S3c2443x Test B - D Driver

# Verify device node ls -l /dev/sec_testbd # → crw-rw---- 1 root video 250, 0 Mar 23 12:34 /dev/sec_testbd

The Sec S3c2443x Test B D Driver is a reference implementation of a low‑level device driver for the Sec S3c2443x series of System‑on‑Chip (SoC) peripherals. It is primarily used in embedded Linux environments to validate the functionality of the “Test B D” hardware block, which provides a programmable interface for secure data handling, cryptographic acceleration, and DMA‑based I/O. Sec S3c2443x Test B D Driver

# Perform a secure DMA copy (user‑space program) ./testbd_tool --dma --src 0x80000000 --dst 0x81000000 --len 1048576 --encrypt # Verify device node ls -l /dev/sec_testbd #

struct resource *res; int ret;

/* 1. Acquire memory region */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); testbd->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(testbd->base)) return PTR_ERR(testbd->base); base = devm_ioremap_resource(&pdev-&gt

/* 4. Register char device */ ret = alloc_chrdev_region(&dev_num, 0, 1, "sec_testbd"); if (ret) return ret; cdev_init(&testbd->cdev, &sec_testbd_fops); testbd->cdev.owner = THIS_MODULE; ret = cdev_add(&testbd->cdev, dev_num, 1); if (ret) goto err_unregister;