The RCA RM4100 was originally designed by Thomson Electronics and was called the IP1000. I was then manufactured by RCA and named the RM4100. It is a great little set-top-box for coreboot.
|CPU works||OK||Mobile Intel(R) Celeron(TM) CPU 733MHz|
|L1 cache enabled||OK|
|L2 cache enabled||OK||256 KB|
|L3 cache enabled||N/A|
|Multiple CPU support||N/A|
|SO-DIMM||OK||Onboard 128MB PC133|
|Dual channel support||N/A|
|On-board IDE 3.5"||OK||Tested with hard drive|
|On-board IDE 2.5"||OK||Tested with 2.5" hard drive and adapter|
|On-board USB||OK||Tested with USB Keyboard|
|On-board VGA||OK||VGA support in coreboot works fine|
|On-board Ethernet||OK||Onboard Intel 82562ET LAN On Motherboard (LOM) Design|
|On-board Smartcard reader||N/A|
|On-board SD card reader||N/A|
|ISA add-on cards||N/A|
|Audio/Modem-Riser (AMR/CNR) cards||N/A|
|PCI add-on cards||N/A|
|Mini-PCI add-on cards||Unknown|
|PCI-X add-on cards||Unknown|
|AGP graphics cards||N/A|
|PCI Express x1 add-on cards||N/A|
|PCI Express x2 add-on cards||N/A|
|PCI Express x4 add-on cards||N/A|
|PCI Express x8 add-on cards||N/A|
|PCI Express x16 add-on cards||N/A|
|PCI Express x32 add-on cards||N/A|
|HTX add-on cards||N/A|
|Legacy / Super I/O|
|Serial port 1 (COM1)||OK|
|Serial port 2 (COM2)||OK||IR is connected to COM2|
|Parallel port||OK||There is no actual Parallel connector, the Parallel is used to enable IR and control 3 LED's|
|Sensors / fan control||OK||lm_sensors uses I801, smsc47m192|
|CPU frequency scaling||Untested|
|Other powersaving features||WIP|
|Nonstandard LEDs||OK||Controled by Parallel Port|
|High precision event timers (HPET)||N/A|
|Random number generator (RNG)||N/A|
|Wake on modem ring||Untested|
|Wake on LAN||Untested||Enabled on LOM Design, should work fine but untested|
|Wake on keyboard||Untested||Supported by the Super I/O but not implimented|
|Wake on mouse||N/A|
Building a coreboot image
Before building coreboot for the RCA RM4100 there are a few settings to consider.
1. Do you want to use VGA for your application?
You have the ability to build a “headless” version of coreboot that will only output to the serial console.
For a “headless” build follow these instructions:
# option ROM_SIZE = 1024 * 1024
option ROM_SIZE = 1024 * 1024
option ROM_SIZE = (1024 * 1024) - (64 * 1024)
# option ROM_SIZE = (1024 * 1024) - (64 * 1024)
option CONFIG_CONSOLE_VGA = 1 and option CONFIG_PCI_ROM_RUN = 1
option CONFIG_VIDEO_MB = 8
Comment out these lines so it looks like this:
# chip drivers/pci/onboard # Onboard VGA device pci 2.0 on end # VGA (Intel 82830 CGC) # register "rom_address" = "0xfff00000" # end
If you do want VGA you can choose how much memory is pre-allocated for VGA. Possible options are:
## 0 for No memory pre-allocated (Graphics memory Disabled) ## 512 for DVMT (UMA) mode, 512K of memory pre-allocated for frame buffer ## 1 for DVMT (UMA) mode, 1M of memory pre-allocated for frame buffer ## 8 for DVMT (UMA) mode, 8M of memory pre-allocated for frame buffer
To adjust this edit targets/rca/rm4100/Config.lb and change option
and change it to any of the options above. Note: Remember that if you do want VGA you will need the vga bios file (vga.rom).
2. Next you will need to prepare a payload. See the Payloads page for your options. For this Tutorial I will use filo to boot from a hard drive to Grub/Fedora Core 7. In the filo directory run
like instructed in the INSTALL directions and then edit Config. Change:
MENULST_FILE = "hda3:/boot/filo/menu.lst"
to (menu.lst is a symlink to grub.conf and filo does not like that)
MENULST_FILE = "hda1:/boot/grub/grub.conf"
to boot to grub on the compact flash or
MENULST_FILE = "hdc1:/boot/grub/grub.conf"
to boot to grub on the harddrive (if you have the HD hack installed).
#SERIAL_SPEED = 115200
SERIAL_SPEED = 115200
to insure we get output to the serial console. That should be it. Now you can run
again to build your payload elf file. Once that finishes copy filo.elf to the /tmp directory, or you can adjust targets/rca/rm4100/Config.lb to point to where filo.elf is.
3. Now we are ready to build core boot.
cd ~/coreboot-v2/targets ./buildtarget rca/rm4100 cd rca/rm4100/rm4100 make
If your using VGA to now need to prepend your video bios to the coreboot.rom. Copy your vga bios file (vga.rom) to the ~/coreboot-v2/targets/rca/rm4100/rm4100 directory.
cat vga.rom coreboot.rom > bios.bin
4. At last your ready to flash bios.bin to your RM4100. If this is the first time, meaning your rm4100 still has the original bios, you need to use the method on the RM4100 Customizing website to flash otherwise you can just use flashrom.