![]() ![]() Revision 4450 introduced a new key (Boot → RtcHibernateAware) which improved the situation with hibernation compatibility and reduced the impact of some security issues in this process. However, if RtcHibernateAware does not work for you, enabling AppleRTC patch and using HibernationFixup may be a safer workaround. You should DISABLE them if you have no issues with BIOS preferences afterwards or use HibernationFixup. Note, that AppleRTC or FixRTC patches effectively break hibernation by reducing the available RTC memory and avoiding encryption key preservation. While it is extremely recommended to be turned on if you rely on hibernation, it may not work on your hardware (should be fine on Ivy Bridge and newer at least), and is thus optional and disabled by default. This option relies on a poorly documented (or rather undocumented) RTC memory access, and unspecified RTC memory layout, which is implementation-specific. To workaround this issue a new option enabling RTC memory erase upon waking from hibernation was added:īoot > RtcHibernateAware = YES (BOOLEAN, off by default) More details could be found in this message. To be used for Hibernation modes 25 & 3 with Lilu.kext and HibernationFixup.kext.Ī data leak issue was identified in the hibernation code, allowing hibernation encryption key to be passed to the system through RTC and preserved till the next hibernation without a subsequent erase. However, the graphics output protocol is not in anyway modified so if the OS draws after it is started then it is after the boot screen is drawn and will overwrite the custom logo, at least for now. The CustomLogo key can also be used under GUI/Custom/Entries in conjunction with BootBgColor for a different screen for every OS. If no option is specified then the boot screen will be drawn only for >= 10.10 Yosemite, so it remains compatible with previous behavior. - A base64 encoded PNG, BMP, or ICNS data.Path - A file path to load a custom image from.None - Use no logo only background color, gray if not specified by custom entry.Theme - Use the theme boot screen for entry type - NOT IMPLEMENTED.Alternate - Use the alternate white on black apple logo.Apple - Use the default gray on gray apple logo.true - Uses the default boot style, Apple. ![]() To do this manually you may launch Shell.efi (this is the first button in low row at the Clover GUI).CustomLogo OR OR Apple/Alternate/Theme/None/Path OR PNG/BMP/ICNS base64 data Įnable the drawing of the custom boot logo. Second button in low row will perform the writing /EFI/CLOVER/CLOVERX64.EFI into BIOS as first boot option. Moreover Clover is able to write itself as boot option in UEFI BIOS to start the fileĪnd this is recommended configuration because BOOTX64.EFI and bootmgfw.efi will be rewritten at the next Windows update while CLOVER will stay forever. EFI/Microsoft/Boot/bootmgfw.efi -> /EFI/Microsoft/Boot/bootmgfw-orig.efiĬLOVERX64.EFI -> /EFI/Microsoft/Boot/bootmgfw.efiĬlover knows what is bootmgfw-orig.efi and is able to start it if we choose to start Windows from Clover. Some BIOSes have own interface to tune what application to start.Īs we want Clover then we have to mimic to the BIOS-known variant. Some BIOSes tuned to search /EFI/Microsoft/Boot/bootmgfw.efi Usually an UEFI BIOS searches /EFI/BOOT/BOOTX64.EFI. ![]() Modern computers have UEFI BIOS which is much larger then legacy BIOS and able to start some EFI-applications from some drives. It can be installed from macOS by commandĭd if=/dev/rdisk0s1 count=1 bs=512 of=origbsĭd if=origbs of=newbs skip=3 seek=3 bs=1 count=87 conv=notruncĭd if=newbs of=/dev/rdisk0s1 count=1 bs=512 We have several variants but recommended one is boot0af So use boot1hfs on HFS+ filesystem, use boot1f32 on FAT32 filesystem, boot1ex on exFAT file system and more.Īfter years of investigations we decided to choose one case:ĭrive must be formatted to GPT and have first partition EFI formatted to FAT32. The program PBR intended to use on the specific file-system. The program boot0 searches the partition table of the drive, finds first partition position (PBR) on the drive and reads there first one or two sectors named boot1. The BIOS read first sector (MBR) from the physical drive into memory and start is as a program written in 16bit codes. Old computers (legacy computers) have legacy BIOS which is able to boot some drive HDD, CDROM or USB-HDD. When you power on your computer you see BIOS which want to start some operating system. If you want to make this manually then read carefully. Each Clover revision contains file Clover***.pkg which is macOS executable installer to make all work automatically. ![]()
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