Uefitool microcode5/18/2023 ![]() Fortunately the chip is socketed so no soldering is required. The BIOS firmware is stored on a serial flash chip on the motherboard. Legacy BIOS is 16-bit and limited to 1 MB of memory. UEFI is a big improvement over legacy BIOS which dates back to the first IBM PC’s created in the 1980’s. There can be enhanced boot speeds and some even provide Internet access and games. It implements secure boot which can help prevent malware from hijacking the boot process. UEFI increases maximum hard drive size from 2.2 TB to 9.4 ZB (zettabytes). UEFI typically sports a friendly graphical user interface with animation as opposed to text-based keyboard only. UEFI (Unified Extensible Firmware Interface) is a specification for a more robust version of BIOS which addresses many of its old predecessor’s short comings. This newer PC has a UEFI BIOS which complicates things a little bit. However, that tutorial featured a traditional BIOS. You may want to check it out because it goes into more detail about the BIOS and shows a low-cost programming solution using a Pi. In my previous BIOS tutorial I repaired a Dell with a bricked BIOS using a Raspberry Pi and FlashRom. Their conclusion was a bad motherboard (out of warranty) and they estimated $500 to fix it (includes shipping) assuming that it was the actual problem.Ī little online research indicated that reboot loops are a common problem with the ASUS X99 motherboard and one possible cause is a corrupt BIOS firmware which could be remedied with a BIOS upgrade, which is more difficult to accomplish when the computer won’t boot. None of the aforementioned corrected the rebooting loop. We disconnected all the peripherals, spent a lot of time moving RAM sticks around, tested the power supply, disconnected the CPU and removed the graphics card. Is not getting past the POST (Power On Self-Test) so the CMOS is not accessible. After a few more seconds it powers back on by However, a few seconds later it shuts off. Upon power up, the computer lights up, fans The computer is stuck in a rebooting loop. Both the CPU and the graphics card are liquid This model has an Intel i7-6850K CPU running at 4 GHz with 32 GB of DDR4 RAM and a GTX 1080 graphics card. Boot the system.The broken computer is made by Digital Storm which is a Silicon Valley company specializing in performance computers. Enable DCI through the BIOS menu, ie, > ħ. Write it back to the BIOS image with UEFITool v2.8Ħ. It is setting IA32_DEBUG_INTERFACE MSR to 0x40000000 (setting lock bit).Ĥ. Extract that module and disassemble the code around those bytes. There will be 2 hits, both in the SiInit PEI module.ģ. With UEFITool, search for the hex pattern "b9 80 0c 00 00" which is the instruction to move 0xc80 (the MSR #) to ECX. I used v61 simply as the latest version at the time.Ģ. A friend of mine told me UP Squared Pro Atom Quad Core 0464 was compatible with the Intel BIOS and debugging through Intel System Debugger.ġ.You could enable DCI by patching the AMI BIOS and flashing it (details below).Updating this thread with my latest findings: Suggestion on things to try to workaround the issue while enabling DCI is veery appreciated too. I purchased the board for the DCI debugging capability available with the Intel BIOS, so switching to another BIOS is not an option unless it came with DCI enabled. This is was never seen with mine bought about 2 years ago and another friend's one bought just three months ago. ![]() If I write back to the proprietary BIOS, it of course boots fine (a pic attached). Attached are the logs from my board (ends at FspFindFspHeader) and the log from a friend of mine showing the successful flow, both with debug-build Intel BIOS. To be more precise, the board fails to complete FSP initialization and freezes at a black screen. I purchased UPS-APLX (Atom Intel E3950 model) last month and discovered that the open source firmware provided by Intel (*1, *2) no longer worked.Ĭan anyone comment on if this is the case and if there will be a fix?
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