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  1. I experimented with various options to boot Windows Vista from Windows 10's Windows Boot Manager in UEFI mode and I done it today . - On VMware, I created 2 separate partitions (one for 10 and one for Vista) and installed Windows 10 in UEFI mode. - Then, I set Boot policy to Legacy from Standard to show Windows Boot Manager in text mode. - Then I installed Windows Vista on the 2nd partition and it gives 0x0000001E error (obviously .). - When I press F10 while Vista's boot entry is highlighted, I added /DEBUG /DEBUGPORT=COM1 and /BAUDRATE=115200 to boot arguments (or select Debugging Mode from F8 menu,). - When I did the above things and then pressed ENTER to boot system, somehow, Windows Vista BOOTS with Windows 10's Windows Boot Manager in UEFI mode! It finished SysPrep phase and I'm able to reach desktop. - When I remove DEBUGPORT and BAUDRATE, it gives 0x0000001E bugcheck error. - Also removing BAUDRATE and then L changing DEBUGPORT to USB or, L changing DEBUGPORT to 1394 and setting CHANNEL to 1 also causes 0x0000001E bugcheck error. - Without DEBUG option, adding /DEBUGPORT=COM1 /BAUDRATE=115200 also boots system. - Also, without DEBUG and BAUDRATE option, system boots. - So, I think, DEBUGPORT=COM1 to COM4 does all this thing, I guess . - Then, I tried that thing on a real machine (on my spare laptop, Casper CGA-P847, has text-based Phoenix UEFI BIOS.) and also boots with it! I will write updates to inform you about all things about that. UPDATE 1: I don't know if it is caused from debugging parameters or Windows Boot Manager itself, Windows Media Sharing just won't work. It freezes the system instantaneously. UPDATE 1.1: It looks like debugging parameters causing freeze on system while Windows Media Sharing is open . UPDATE 1.2: Yup, debugging options definitely cause issues with this. I even tried with Windows Vista's original Windows Boot Manager in UEFI mode on VMware. When I disable Windows Media Player Network Sharing Service, the system will boot even when a device is shared. But when I reboot the system, re-enable Windows Media Player Network Sharing Service and when I click start Windows Media Player Network Sharing Service, the system will instantly freeze. UPDATE 2: When I debug output in VMware using serial port, I saw repeating output like this: This pattern repeats over and over again and it's 85 hexadecimal long. And these repeated dots are 7C hexadecimal long.
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