Hello Kevin, I can use SeaBIOS to initialize vga and return to coreboot now.
But when I returned to coreboot and call int19, nothing happens. It can boot correctly when call int19 in SeaBIOS. Maybe it has something to do with the stack? How can I call the interrupt of SeaBIOS in coreboot? 2008/7/14, Zhang Rui <[EMAIL PROTECTED]>: > 2008/7/14, Kevin O'Connor <[EMAIL PROTECTED]>: > >[...] > > Right - seabios needs to be using its stack in order to call 16bit > > functions. You probably need to save and restore the stack. > [...] > I used this: > "movl %esp, %esi\n" > "movl $" __stringify(BUILD_STACK_ADDR) ", %esp\n" > "ljmp $0x10, $post_coreboot\n" > > and added this at the end of post_coreboot() function: > asm( > "movl %esi, %esp\n" > "retl" > ); > Then it can return to coreboot correctly. Till the payload(I used no > payload here) > > But pci_dev_init() is executed more than one time so vga is > initialized more than one time in SeaBIOS. A flag variable would be > used to run SeaBIOS only once. > This is fixed now. > > > > However, note that the above wont save/restore the idt/gdt. And > > again, I'm not sure if coreboot puts its stack/idt/gdt somewhere where > > seabios may overwrite it. [...] > And I want to know where will SeaBIOS write in the memory. Such as the > range of bda and ebda? > ? Best regards. Zhang Rui -- coreboot mailing list [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
