Video Walrus Ltd
Event & Television Technical Services
Broadcast engineering, live streaming, and production technology solutions for events and television.
System design, integration, and support for live television production workflows.
WebRTC, RTMP, and SRT streaming solutions for remote production, corporate events, and multi-site connectivity.
Custom tooling, hardware integration, and technical consultancy for production teams working at the edge of what's possible.
On-site technical direction and engineering for live events, conferences, and outside broadcasts. Vision Engineering in OBs or studios. Vision supervisor on events.
err_unregister: unregister_chrdev_region(dev_num, 1); return ret;
struct sec_testbd_dma_desc SEC_TESTBD_DMA_DECRYPT */ ; The driver writes the descriptor into the SMI registers, triggers the transfer, and waits for the completion interrupt. Errors such as address misalignment or length overflow generate -EINVAL . Through SEC_TESTBD_IOCTL_CRYPTO , the user can request a single‑shot operation: Sec S3c2443x Test B D Driver
/* 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->
/* 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; base)) return PTR_ERR(testbd->
# Run a cryptographic hash benchmark ./testbd_tool --crypto --algo sha256 --src 0x82000000 --len 4194304
| Parameter | Meaning | |-----------|---------| | mode | 0 = buffer‑overflow test, 1 = timing jitter, 2 = fault‑injection | | iterations | Number of stress cycles (max 10 000) | | seed | Pseudo‑random seed for pattern generation |