HP EliteBook Folio 9480m¶
This page is about the notebook HP EliteBook Folio 9480m.
HP EliteBook Folio 9480m was released in 2014 and is now end of life. It can be bought from a secondhand market like Taobao or eBay.
Required proprietary blobs¶
The following blobs are required to operate the hardware:
- EC firmware
- Intel ME firmware
HP EliteBook Folio 9480m uses SMSC MEC1322 as its embedded controller. The EC firmware is stored in the flash chip, but we don’t need to touch it or use it in the coreboot build process.
Intel ME firmware is in the flash chip. It is not needed when building coreboot.
The Haswell memory reference code binary is needed when building coreboot. Please see mrc.bin.
Before flashing, remove the battery and the hard drive cover according to the Maintenance and Service Guide of this laptop.
Two flash chips of HP EliteBook Folio 9480m
HP EliteBook Folio 9480m has two flash chips, a 16MiB system flash, and a 2MiB private flash. To install coreboot, we need to program both flash chips. Read HP Sure Start for detailed information.
To access the system flash, we need to connect the AC adapter to the machine, then clip on the flash chip with an SOIC-8 clip. An STM32-based flash programmer made with an STM32 development board is tested to work.
To access the private flash chip, we can use a ch341a based flash programmer and flash the chip with the AC adapter disconnected.
Before flashing coreboot, we need to do the following:
- Erase the private flash to disable the IFD protection
- Modify the IFD to shrink the BIOS region, so that we’ll not use or override the protected bootblock and PEI region, as well as the EC firmware
To erase the private flash chip, attach it with the flash programmer via the SOIC-8 clip, then run:
flashrom -p <programmer> --erase
To modify the IFD, we need a new flash layout. The flash layout of the OEM firmware is:
The default coreboot configuration sets the flash chip size to 12MiB, so set the end of the BIOS region to 0xbfffff in the new layout. The modified IFD is as follows (Platform Data region pd is the region protected by HP Sure Start):
Write the above layout in a file, and use ifdtool to modify the IFD of a flash image.
Suppose the above layout file is
layout.txt and the origin content of the system flash
ifdtool -n layout.txt factory-sys.rom
Then a flash image with a new IFD will be in
Flash the IFD of the system flash:
flashrom -p <programmer> --ifd -i fd -w factory-sys.rom.new
Then flash the coreboot image:
# first extend the 12M coreboot.rom to 16M
fallocate -l 16M build/coreboot.rom
flashrom -p <programmer> --ifd -i bios -w build/coreboot.rom
After coreboot is installed, the coreboot firmware can be updated with internal flashing:
flashrom -p internal --ifd -i bios --noverify-all -w build/coreboot.rom
The board can be debugged with EHCI debug. The EHCI debug port is the USB port on the left.
- GRUB payload freezes just like previous EliteBook laptops
- Sometimes the PCIe WLAN module can not be found in the OS after booting to the system
- Sometimes all the USB devices can not be found in the OS after S3 resume
- Fingerprint reader
- Smart Card reader
- i5-4310U CPU with 4G+4G memory
- SATA and M.2 SATA disk
- SD card reader
- Keyboard and touchpad
- Audio output from speaker and headphone jack
- EC ACPI
- S3 resume
- Arch Linux with Linux 5.8.9
- Memory initialization with mrc.bin version 1.6.1 Build 2
- Graphics initialization with libgfxinit
- Payload: SeaBIOS, edk2
- EC firmware
- KBC Revision 92.15 from OEM firmware version 01.33
- KBC Revision 92.17 from OEM firmware version 01.50
- Internal flashing under coreboot
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