gdbplus's Substack
gdbplusMy personal Substack
| Platform |  | Pricing | Only free issues | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 37 | Founded | 5 months ago | Last Issue | 12 days ago |
| Active | |||||
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gdbplus.substack.comLatest Issues
/dev/mem + mmap: Accessing ACPI MMIO Regions from Linux Userspace
By David Zhu | GDBplus
Most developers interact with hardware through kernel drivers. The kernel abstracts away physical addresses behind files, sysfs nodes, and ioctl() interfaces. But there’s a direct path: /dev/mem — the physical memo...
16550 UART Hardware Flow Control: What Every BIOS Engineer Should Know
By David Zhu | GDBplus
If you’ve ever debugged a firmware hang by watching serial output, you’ve trusted the 16550 UART to deliver every byte. But here’s the uncomfortable truth: at 115200 bps, that 16-byte RX FIFO fills in 1.4 mill...
How .vfr Files Form a UEFI Setup Page — The Complete Pipeline
By David Zhu · gdbplus.substack.com
When you enter BIOS Setup and see those configuration menus — the gray-and-blue screens with dropdowns, checkboxes, and numeric inputs — you’re looking at the output of a remarkably elegant pipeli...
0x5A — The Command That Lets Flash Chips Describe Themselves
Linkedin: DavidZhu
SPI NOR flash has been a boot firmware workhorse for decades. But for most of that history, every flash chip was a black box — you either had the datasheet hardcoded into your bootloader, or you were in trouble.
JEDEC f...
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...
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STM32/UEFI BIOS/Linux Driver Developer and Writer
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