gdbplus's Substack
gdbplusMy personal Substack
| Platform |  | Pricing | Only free issues | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 33 | Founded | 4 months ago | Last Issue | 7 days ago |
| Active | |||||
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gdbplus.substack.comLatest Issues
eSPI EC/SIO UART Access and Enablement in UEFI BIOS
Linkedin: Click David Zhu
The serial port has been the firmware engineer’s eyes and ears for decades. But the physical path from CPU to UART has fundamentally changed. LPC gave way to eSPI, and the debug UART that used to live on a simple...
How EDK2 BDS Finds the UEFI Shell as a Boot Option
David Zhu
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You power on a QEMU VM with OVMF firmware. The UEFI Shell appears in the boot menu. You type exit, and your OS boots. But have you ever wondered — how did BDS know the Shell was even there?
Unlike a disk-based O...
Why You Never Need to Define gBS and gSmst — EDK2’s Library Constructor Magic
Linkedin: click DavidZhu
If you’ve written any EDK2 driver, you’ve typed gBS->AllocatePool(...) or gSmst->SmmAllocatePool(...) without ever declaring those variables. They just work. But why?
The short answer: EDK2’s library co...
Deep Dive into Winbond W25Q256JV: A Datasheet Guide for Firmware and Linux Developers
Linkedin : click David Zhu
The Winbond W25Q256JV is a workhorse 256 Mbit (32 MB) Serial NOR flash. It shows up on motherboards, embedded Linux boards, and anywhere you need reliable, fast non‑volatile storage for firmware. If you’re writin...
EDK2 SW SMI: All Four Register Approaches and the Dispatch Architecture
Linkedin: click David Zhu
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The Software SMI (SW SMI) is the primary inter-process communication mechanism between the Normal World (DXE/Runtime) and the Secure World (SMM) in UEFI firmware. Understanding exactly how an...
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STM32/UEFI BIOS/Linux Driver Developer and Writer
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