[coreboot] No graphics with libpayload payloads (Tint, coreinfo) when coreboot is built without serial console

[Paul Menzel]

Dear coreboot folks,

when building coreboot without serial console for QEMU and when trying
to run the payloads Tint [1] (or coreinfo) in it, no graphics comes up
and the payloads are not loaded.

Just enabling serial console fixes the problem. Tinycurses is used in
libpayload as there were problems building Tint with PDCurses.

This problem was already present last week and is still with an image
built from latest master [2].

commit 216a619a74d61f66e3d3e1d668028d11a8868b4d
        Author: Kyösti Mälkki 
        Date:   Mon May 12 23:16:18 2014 +0300

Rambi: Enable 32k SUSCLK signal

Please find the `.config` and the coreboot log captured over QEMU’s
debug console attached.

$ build/cbfstool build/coreboot.rom print
        bios.bin: 256 kB, bootblocksize 848, romsize 262144, offset 0x0
        alignment: 64 bytes

Name                           Offset     Type         Size
        fallback/romstage              0x0        stage        20965
        fallback/ramstage              0x5240     stage        55954
        fallback/payload               0x12d40    payload      23175
        config                         0x18800    raw          3299
        (empty)                        0x19540    null         157464
        $ ln -s coreboot.rom build/bios.bin
        $ qemu-system-i386 -M q35 -bios build/bios.bin -hda /dev/zero -serial stdio -chardev file,id=debugcon,path=/tmp/qemu--dynamic-cbmem--without-serial--tint-lzma.log -device isa-debugcon,iobase=0x402,chardev=debugcon

Thanks,

Paul

[1] http://www.coreboot.org/Tint
[2] http://review.coreboot.org/5722