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+# HP EliteBook Folio 9480m
+
+This page is about the notebook [HP EliteBook Folio 9480m].
+
+## Release status
+
+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:
+
+1. EC firmware
+2. Intel ME firmware
+3. mrc.bin
+
+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](../../northbridge/intel/haswell/mrc.bin).
+
+## Programming
+
+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](folio_9480m_flash.webp)
+
+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:
+
+1. Erase the private flash to disable the IFD protection
+2. 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:
+
+ 00000000:00000fff fd
+ 00001000:00002fff gbe
+ 00003000:005fffff me
+ 00600000:00ffffff bios
+
+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):
+
+ 00000000:00000fff fd
+ 00001000:00002fff gbe
+ 00003000:005fffff me
+ 00600000:00bfffff bios
+ 00eb5000:00ffffff pd
+
+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
+is in ``factory-sys.rom``, run:
+
+ ifdtool -n layout.txt factory-sys.rom
+
+Then a flash image with a new IFD will be in ``factory-sys.rom.new``.
+
+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
+
+## Debugging
+
+The board can be debugged with EHCI debug. The EHCI debug port is the USB port on the left.
+
+## Test status
+
+### Known issues
+
+- 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
+
+### Untested
+
+- Fingerprint reader
+- Smart Card reader
+
+### Working
+
+- i5-4310U CPU with 4G+4G memory
+- SATA and M.2 SATA disk
+- Ethernet
+- WLAN
+- WWAN
+- SD card reader
+- USB
+- Keyboard and touchpad
+- DisplayPort
+- VGA
+- Dock
+- Audio output from speaker and headphone jack
+- Webcam
+- TPM
+- 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, Tianocore
+- 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
+
+## Technology
+
+```eval_rst
++------------------+-----------------------------+
+| CPU | Intel Haswell-ULT |
++------------------+-----------------------------+
+| PCH | Intel Lynx Point Low Power |
++------------------+-----------------------------+
+| EC | SMSC MEC1322 |
++------------------+-----------------------------+
+| Coprocessor | Intel Management Engine |
++------------------+-----------------------------+
+```
+
+[HP EliteBook Folio 9480m]: https://support.hp.com/us-en/product/hp-elitebook-folio-9480m-notebook-pc/7089926
+[Maintenance and Service Guide]: http://h10032.www1.hp.com/ctg/Manual/c05228980
+[STM32-based flash programmer]: https://github.com/dword1511/stm32-vserprog
+[HP Sure Start]: hp_sure_start.md
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