SeaBIOS patches: advanced_bootmenu, multiple_floppies

If you'd like to add many useful floppies to your coreboot (learn more:
http://dangerousprototypes.com/docs/Lenovo_G505S_hacking#Useful_floppies
), or to use your USB numpad for choosing a SeaBIOS boot entry, -
- then this change is for you! It contains two valuable patches
together with a Makefile mod needed to automatically apply these patches
to a cloned SeaBIOS before its' compilation.

advanced_bootmenu: up to 35 entries (2 pages if >18), numpad console
https://mail.coreboot.org/hyperkitty/list/seabios@seabios.org/thread/CKWLNTZU43SAHQ26USNFASORA2H5BXBE/

[PATCH v2] ramdisk: search for all the available floppies instead of one
https://mail.coreboot.org/pipermail/seabios/2018-December/012670.html

Patch descriptions are available at these links, and here's a copy:

advanced_bootmenu: up to 35 entries (2 pages if >18), numpad support

Add support for up to 35 boot menu entries (2 pages if >18). To solve
the ">10" problem currently experienced by SeaBIOS users (there are no
11, 12, etc. keys on a keyboard - so impossible to choose the last menu
entries if you got >10 entries because of multiple hard drives /
secondary payloads / floppies) - the boot menu has been extended to the
letter keys. NOTE: TPM menu has been moved from T to M letter: it is at
the end of keyboard's 3rd row of letters and "Trusted" is adjective
while "Module" is a noun; alternatively could press '-'.

Also, add support for a numpad. Small USB numpad could be really
convenient for choosing the boot entries at coreboot boards used as
(maybe headless) servers. '/' char on numpad could be used to open the
boot menu or to exit it. If there are >10 boot menu entries - the numpad
console interface will be enabled: press one or two digit keys and then
ENTER to confirm your choice, or remove a digit by pressing the '.Del'
key. Also you could call TPM with '-' key at any moment, or boot with a
single key press of your fullsize keyboard.

[PATCH v2] ramdisk: search for all the available floppies instead of one

All the floppy images available at CBFS will be found and listed in a
boot menu, instead of the first found. Could be highly valuable if you
are participating in a hobby OS development - would like to test
multiple versions of your floppy at the same coreboot image, to reduce
the amount of re-flashes and accelerate the development at bare metal -
or simply you would like to access multiple floppies as a coreboot user.
For example: KolibriOS (nice assembly OS with GUI and apps), FreeDOS,
MichalOS, Snowdrop and memtest (coreboot's memtest version is buggy,
e.g. external USB keyboard isn't working at some laptops; floppy is
much better)

Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Change-Id: Idf4efba31091a8678b51c2f6541d440c5cc6d37d
---
M payloads/external/SeaBIOS/Makefile
A payloads/external/SeaBIOS/advanced_bootmenu.patch
A payloads/external/SeaBIOS/multiple_floppies.patch
3 files changed, 601 insertions(+), 5 deletions(-)