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The Nuvoton WPCM450, codenamed Hermon is a BMC which was used in server mainboards from multiple vendors. It is closely related to the Nuvoton NPCM7xx BMCs (Poleg) and NPCM8xx (Arbel) BMC family. There is also some similarity to the earlier Winbond W90 and Nuvoton NUC900 chip families.

• various Supermicro X7/X8/X9 boards, e.g. Supermicro X9SCI-LN4F
• Dell PowerEdge R210 II and others (list)

Features

The following table summarizes the state of software support for various SoC features.

• ATEN, AMI, and DELL indicate that the respective vendor kernel contains a driver
• blob means that one of the vendors shipped a driver in binary form
• 5.x patch means that I have a patch for modern Linux, adding driver and/or devicetree tree support
• mainline means that the feature is supported on mainline drivers and devicetrees for WPCM450, and since when

Feature	ATEN	AMI	DELL	blob	5.x patch	mainline	comments
CPU: ARM926EJ-S	✓	✓	✓		✓	5.13-rc1	very common CPU
Interrupt controller	✓	✓	✓		✓	5.13-rc1
Timer	✓	✓	✓		✓	5.13-rc1	same as in NPCM750
Watchdog			✓		✓	5.13-rc1	same as in NPCM750
UART	✓	✓	✓		✓	5.13-rc1	same as in NPCM750
Clock tree					✓		Configured in bootloader
SPI/FIU	✓	✓	✓		✓	6.2-rc1
BIOS flash access				✓
GPIO			✓	✓	✓	5.18-rc1
pinmux			✓	✓	✓	5.18-rc1
Ethernet		✓		✓	✓		OpenBMC has driver for NPCM750
Ethernet NC/SI		✓		✓	✓		generally broken in mainline
I2C			✓	✓			compatible with NPCM750
PWM			✓	✓
Fan tachometer			✓	✓
USB	✓		✓	✓
PECI			✓	✓
ADC			✓	✓
GFXI				✓
VCD				✓
LPC			✓	✓			IPMI KCS and BIOS POST codes
SD/MMC			✓

License

All content in this wiki is published under the CC-BY-4.0 license.

References

• Supermicro SCI-LN4F notes
• ATEN's port of Linux 2.6.17
• AMI's port of Linux 2.6.24
• DELL's port of Linux 2.6.23.1
• My own WIP Linux branch
• Winbond W90N745 datasheet
• Nuvoton's kernel tree for NPCM7xx and NPCM8xx BMCs
• Mirrors of this wiki: GitHub, GitLab, Codeberg