On Thu, May 31, 2018 at 11:12:14AM -0400, Kevin O'Connor wrote: > On Thu, May 31, 2018 at 08:33:50AM +0200, Gerd Hoffmann wrote: > [...] > > + dprintf(1, "bochs-display: using %dx%d, %d bpp (%d stride)\n" > > + , FRAMEBUFFER_WIDTH, FRAMEBUFFER_HEIGHT > > + , FRAMEBUFFER_BPP * 8, FRAMEBUFFER_STRIDE); > > + > > + cbvga_setup_modes(lfb_addr, FRAMEBUFFER_BPP * 8, > > + FRAMEBUFFER_WIDTH, FRAMEBUFFER_HEIGHT, > > + FRAMEBUFFER_STRIDE); > > + > > + writew(dispi + VBE_DISPI_INDEX_XRES, FRAMEBUFFER_WIDTH); > > + writew(dispi + VBE_DISPI_INDEX_YRES, FRAMEBUFFER_HEIGHT); > > + writew(dispi + VBE_DISPI_INDEX_BPP, FRAMEBUFFER_BPP * 8); > > + writew(dispi + VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED); > > + > > + writeb(vga, 0x20); /* unblank (for qemu -device VGA) */ > > An additional question - if the mode can be changed why do we only > change it on startup? Is the idea that the OS will have a driver > installed that directly changes modes once the OS starts up?
Yes. On linux bochs-drm.ko can handle the device. Also modesetting isn't that easily in real mode due to the registers being in a 32bit mmio bar. setup() is fine due to running in big real mode. cheers, Gerd _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
