Hello Peter, Did not understand... I must admit! As of my best interpretation SeaBIOS has 5 functions which makes BIOS legacy:
get and set variables, get and set real time clock, reset. Or maybe, something changed. I went back, to inspect CSM code in SeaBIOS, and found the following: # # General Features # # CONFIG_COREBOOT is not set # CONFIG_QEMU is not set *CONFIG_CSM=y <<==================== set CSM ON* # CONFIG_QEMU_HARDWARE is not set CONFIG_THREADS=y CONFIG_RELOCATE_INIT=y CONFIG_BOOTMENU=y CONFIG_BOOTSPLASH=y CONFIG_BOOTORDER=y CONFIG_ENTRY_EXTRASTACK=y CONFIG_MALLOC_UPPERMEMORY=y CONFIG_ROM_SIZE=0 Then make: Compile checking out/src/hw/pcidevice.o Compile checking out/src/hw/ahci.o Compile checking out/src/hw/pvscsi.o Compile checking out/src/hw/usb-xhci.o Compile checking out/src/hw/usb-hub.o Compile checking out/src/hw/sdcard.o Compile checking out/src/fw/coreboot.o Compile checking out/src/fw/lzmadecode.o Compile checking out/src/fw/multiboot.o *Compile checking out/src/fw/csm.o* Compile checking out/src/fw/biostables.o Compile checking out/src/fw/paravirt.o Compile checking out/src/fw/shadow.o Compile checking out/src/fw/pciinit.o Compile checking out/src/fw/smm.o Compile checking out/src/fw/smp.o Compile checking out/src/fw/mtrr.o Compile checking out/src/fw/xen.o Compile checking out/src/fw/acpi.o Compile checking out/src/fw/mptable.o Compile checking out/src/fw/pirtable.o Compile checking out/src/fw/smbios.o Where I see e820 table which is to be passed to OS, in order OS to understand what memory it can use. But I did not find explicitly these 5 functions. So I need a little help here. Where are these functions? Now... How GRUB2 replaces all of these functionalities? I see what you said here (that GRUB2 is directly implemented into FW, thus skipping MBR), but who/what entity is replacing missing SeaBIOS functionalities? Thank you, Zoran On Sat, Feb 11, 2017 at 2:18 PM, Peter Stuge <[email protected]> wrote: > Zoran Stojsavljevic wrote: > > crucial question from me: how Coreboot will work if instead SeaBIOS > > GRUB2 is the payload chosen > > Instead of SeaBIOS reading MBR, GRUB2 will read its configuration > file and operate accordingly. > > > //Peter > > -- > coreboot mailing list: [email protected] > https://www.coreboot.org/mailman/listinfo/coreboot >
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