Burn BIOS in ROM and dump it with DediProg to observe the region of NV_FTW_WORKING. Please follow the steps to observe the reclaiming process. bxrc configuration file, it is obviously not working (because Bochs.exe will be run instead of Bochsdbg.exe). At this time, if we also double-click the. You can invoke pintos with a different option, -r, to set up Bochs for realistic timings, in which a one-second delay should take approximately one second of real time. Similarly, you still need to configure when debugging. On the other hand, when Bochs runs in reproducible mode, timings are not realistic, meaning that a 'one-second' delay may be much shorter or even much longer than one second. #define _PCD_VALUE_PcdFlashNvStorageFtwSpareSize 0x00020000U bochs.exe to be in execution mode and cannot be debugged. #define _PCD_VALUE_PcdFlashNvStorageFtwSpareBase 0xFFFB0000U #define _PCD_VALUE_PcdFlashNvStorageFtwWorkingSize 0x00002000U #define _PCD_VALUE_PcdFlashNvStorageFtwWorkingBase 0xFFFAE000U #define _PCD_VALUE_PcdFlashNvStorageVariableSize 0x0001D000U #define _PCD_VALUE_PcdFlashNvStorageVariableBase 0xFFF90000U #define FLASH_REGION_NVSTORAGE_SUBREGION_NV_FTW_SPARE_OFFSET 0x5b0000 #define FLASH_REGION_NVSTORAGE_SUBREGION_NV_FTW_WORKING_OFFSET 0x5ae000 #define FLASH_REGION_NVSTORAGE_SUBREGION_NV_VARIABLE_STORE_OFFSET 0x590000 By default it is enabled in the current version of Bochs : 1 define BXSUPPORTVMX 2 bxinstrphyaccess can also help you debugging EPT (Extended Page Table) by checking physical addresses. Below files which are generated in build-time provide the regions information. For debugging VMX you should use bxinstrvmexit, but you should be sure to compile your Bochs with this feature enabled. sdl2) guidebug - use GTK debugger gui (sdl, sdl2, x) hideIPS. When the platform restarts after power-off happens on NV reclaiming process, the driver checks the flag NV_FTW_WORKING that the NV reclaiming is not completed, it restores variables from NV_FTW_SPARE into NV_VARIABLE_STORE. Starting with Bochs 1.3, you can use environment variables in the bochsrc file. This page provides a way to observe reclaiming process of EDKII Variable Services with UEFI Fault Tolerant Write Protocol.ĮDKII Variable Services provides reclaim process with the recovery mechanism. I use a PC emulator to run a simple BIOS without breaking my PC at home. I need burn BIOS in PC and see the process so that I can learn more.īut I don't want to use my PC to update BIOS. For me, a computer is necessary to help me thinking. I admire mathematicians who can present their theories in boards with very long formulas without computers. I need to write BIOS program and run it in a machine to make sure that I know something in BIOS. I can tell you the algorithm but not the whole.
How do I proof it? I have blurred BIOS algorithm in my mind but it cannot be correctly run in my brain. Our brains are computers but not quick and correct. The computer of Chinese text is 電 (electrical) 腦 (brain). What is computer? I consider computer is a machine that quickly and automatically runs algorithm.
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