I would like to add my Nuvoton NCT6797D superio chip to the coreboot utility superiotool. With the help of several nice folks on the freenode #coreboot irc channel, I have modified my local superiotool and it works well. I have never made a commit to Gerrit, but I have established Gerrit & Github accounts. I see the page to start a change request at: https://review.coreboot.org/dashboard/self

However, I am not so sure of myself yet, so I'm writing to get advice. Feel free to respond , even if all you have to say is that it's not my place to propose a patch. Here are the details:

coreboot/util/superiotool: Add Nuvoton NCT6797D to coreboot/util/superiotool/nuvoton.c

# diff -u a/nuvoton.c b/nuvoton.c
--- a/nuvoton.c 2020-12-27 22:31:01.116775121 -0600
+++ b/nuvoton.c 2020-12-27 22:31:55.900532400 -0600
@@ -567,6 +567,56 @@
  {0x30,0xe0,0xe1,0xe2,0xe3,EOT},
  {0x20,0x20,0x04,0x05,0x01,EOT}},
  {EOT}}},
+ {0xD451, "NCT6797D", {
+ {NOLDN, NULL,
+ {0x07,0x10,0x11,0x13,0x14,0x1a,0x1b,0x1c,0x1d,0x20,0x21,0x22,0x24,0x25,0x26,0x27,0x28,0x2a,0x2b,0x2c,0x2d,0x2f,EOT},
+ {0x00,0xff,0xff,0x00,0x00,0x30,0x70,0x10,0x00,0xc8,0x03,0xff,0x04,0x00,MISC,0x00,0x00,0xc0,0x00,0x01,0x00,MISC,EOT}},
+ {0x01, "Parallel Port",
+ {0x30,0x60,0x61,0x70,0x74,0xf0,EOT},
+ {0x01,0x03,0x78,0x07,0x04,0x3f,EOT}},
+ {0x02, "UART A",
+ {0x30,0x60,0x61,0x70,0xf0,0xf2,EOT},
+ {0x01,0x03,0xf8,0x04,0x00,0x00,EOT}},
+ {0x03, "UART B, IR",
+ {0x30,0x60,0x61,0x70,0xf0,0xf1,0xf2,EOT},
+ {0x01,0x02,0xf8,0x03,0x00,0x00,0x00,EOT}},
+ {0x05, "Keyboard Controller",
+ {0x30,0x60,0x61,0x62,0x63,0x70,0x72,0xf0,EOT},
+ {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x83,EOT}},
+ {0x06, "Consumer IR",
+ {0x30,0x60,0x61,0x70,0xf0,0xf1,0xf2,0xf3,EOT},
+ {0x00,0x00,0x00,0x00,0x08,0x09,0x32,0x00,EOT}},
+ {0x07, "GPIO 6, GPIO 7, GPIO 8",
+ {0x30,0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xec,0xed,0xf4,0xf5,0xf6,0xf7,0xf8,EOT},
+ {0x00,0x7f,0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,EOT}},
+ {0x08, "WDT1, WDT_MEM, GPIO 0, GPIO 1",
+ {0x30,0x60,0x61,0xe0,0xe1,0xe2,0xe3,0xe4,0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfe,0xff,EOT},
+ {0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,EOT}},
+ {0x09, "GPIO 2, GPIO 3, GPIO 4, GPIO 5",
+ {0x30,0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xee,0xf0,0xf1,0xf2,0xf4,0xf5,0xf6,0xf7,0xfe,EOT},
+ {0x00,0xff,0x00,0x00,0x00,0x7f,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0x00,0x00,0xff,0x00,0x00,0x00,0x00,EOT}},
+ {0x0a, "ACPI",
+ {0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe9,0xec,0xed,0xee,0xf0,0xf2,0xf3,0xf4,0xf6,0xf7,0xfc,0xfe,EOT},
+ {0x01,0x00,0x00,0x00,0x00,0x02,0x1a,0x00,0x00,0x00,0x00,0x00,0x10,0x5c,0x00,0x00,0x00,0xc0,0x00,0x00,EOT}},
+ {0x0b, "Hardware Monitor, Front Panel LED",
+ {0x30,0x60,0x61,0x62,0x63,0x70,0xe0,0xe1,0xe2,0xe3,0xe4,0xe6,0xe7,0xf0,0xf1,0xf2,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,EOT},
+ {0x00,0x00,0x00,0x00,0x00,0x00,0x7f,0x7f,0xff,0xff,0xff,0x08,0xff,0x00,0x00,0x00,0x10,0x00,0x87,0x47,0x00,0x00,0x00,EOT}},
+ {0x0d, "BCLK, WDT2, WDT_MEM",
+ {0xe0,0xe1,0xe7,0xe8,0xeb,0xed,0xf0,0xf3,EOT},
+ {0x00,MISC,0x00,0x32,0x14,0x00,0x00,0x00,EOT}},
+ {0x0e, "CIR Wake-Up",
+ {0x30,0x60,0x61,0x70,EOT},
+ {0x00,0x00,0x00,0x00,EOT}},
+ {0x0f, "GPIO Push-Pull or Open-Drain selection",
+ {0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe9,0xf0,0xf1,0xf2,EOT},
+ {0xff,0xff,0x7f,0xff,0xff,0xff,0x0f,0xff,0xff,0x9d,0x00,0x00,EOT}},
+ {0x14, "Port 80 UART",
+ {0xe0,0xe1,0xe2,0xe3,0xe4,EOT},
+ {0x80,0x00,0x00,0x10,0x00,EOT}},
+ {0x16, "Deep Sleep",
+ {0x30,0xe0,0xe1,0xe2,0xe3,EOT},
+ {0x20,0x20,0x04,0x05,0x01,EOT}},
+ {EOT}}},
  {0xd121, "NCT5539D", {
  {NOLDN, NULL,
  {0x10,0x11,0x13,0x14,0x1a,0x1b,0x1c,0x1d,0x22,0x24,

root@MSI-7C37:~/coreboot/util/superiotool# superiotool -d
superiotool r4.13-726-g7e3126dbc5
Found Nuvoton NCT6797D (id=0xd451) at 0x4e
Register dump:
idx 07 10 11 13 14 1a 1b 1c  1d 20 21 22 24 25 26 27  28 2a 2b 2c 2d 2f
val 0b ff ff ff ff 72 80 10  10 d4 51 ff 00 00 40 00  00 58 00 01 00 02
def 00 ff ff 00 00 30 70 10  00 c8 03 ff 04 00 MM 00  00 c0 00 01 00 MM
LDN 0x01 (Parallel Port)
idx 30 60 61 70 74 f0
val 00 03 78 07 04 3f
def 01 03 78 07 04 3f
LDN 0x02 (UART A)
idx 30 60 61 70 f0 f2
val 01 03 f8 04 00 00
def 01 03 f8 04 00 00
LDN 0x03 (UART B, IR)
idx 30 60 61 70 f0 f1 f2
val 01 02 f8 03 00 00 00
def 01 02 f8 03 00 00 00
LDN 0x05 (Keyboard Controller)
idx 30 60 61 62 63 70 72 f0
val 01 00 60 00 64 01 0c 83
def 00 00 00 00 00 00 00 83
LDN 0x06 (Consumer IR)
idx 30 60 61 70 f0 f1 f2 f3
val 00 00 00 00 ff ff ff ff
def 00 00 00 00 08 09 32 00
LDN 0x07 (GPIO 6, GPIO 7, GPIO 8)
idx 30 e0 e1 e2 e3 e4 e5 e6  e7 ec ed f4 f5 f6 f7 f8
val 02 ff 00 00 00 ff ff ff  ff 00 ff ff ff ff ff ff
def 00 7f 00 00 00 ff 00 00  00 00 00 ff 00 00 00 00
LDN 0x08 (WDT1, WDT_MEM, GPIO 0, GPIO 1)
idx 30 60 61 e0 e1 e2 e3 e4  f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 fa fe ff
val 01 0a 10 ff ff ff ff ff  ff ff ff ff ff 00 00 00  ff 00 ff 00 00
def 00 00 00 ff 00 00 00 00  ff 00 00 00 00 00 00 00  00 00 00 00 00
LDN 0x09 (GPIO 2, GPIO 3, GPIO 4, GPIO 5)
idx 30 e0 e1 e2 e3 e4 e5 e6  e7 e8 e9 ea eb ee f0 f1  f2 f4 f5 f6 f7 fe
val 0f 4f 90 00 00 fa 76 00  00 20 00 01 01 80 3f f0  00 fe e4 00 01 ff
def 00 ff 00 00 00 7f 00 00  00 00 00 00 00 00 ff 00  00 ff 00 00 00 00
LDN 0x0a (ACPI)
idx e0 e1 e2 e3 e4 e5 e6 e7  e9 ec ed ee f0 f2 f3 f4  f6 f7 fc fe
val 01 00 00 04 00 02 9a 00  00 81 01 00 10 5f 00 00  00 c0 a0 00
def 01 00 00 00 00 02 1a 00  00 00 00 00 10 5c 00 00  00 c0 00 00
LDN 0x0b (Hardware Monitor, Front Panel LED)
idx 30 60 61 62 63 70 e0 e1  e2 e3 e4 e6 e7 f0 f1 f2  f5 f6 f7 f8 f9 fa fb
val 01 0a 20 0a 40 00 7f 7f  7f 7f 7f 00 7f 00 00 00  00 00 87 47 00 00 ff
def 00 00 00 00 00 00 7f 7f  ff ff ff 08 ff 00 00 00  10 00 87 47 00 00 00
LDN 0x0d (BCLK, WDT2, WDT_MEM)
idx e0 e1 e7 e8 eb ed f0 f3
val 00 20 10 00 00 00 00 00
def 00 MM 00 32 14 00 00 00
LDN 0x0e (CIR Wake-Up)
idx 30 60 61 70
val 00 00 00 00
def 00 00 00 00
LDN 0x0f (GPIO Push-Pull or Open-Drain selection)
idx e0 e1 e2 e3 e4 e5 e6 e7  e9 f0 f1 f2
val f6 cf ff 7f ff ff ff ff  ff 9d 04 00
def ff ff 7f ff ff ff 0f ff  ff 9d 00 00
LDN 0x14 (Port 80 UART)
idx e0 e1 e2 e3 e4
val 80 00 00 10 aa
def 80 00 00 10 00
LDN 0x16 (Deep Sleep)
idx 30 e0 e1 e2 e3
val a0 20 04 05 01
def 20 20 04 05 01
root@MSI-7C37:~/coreboot/util/superiotool#

Thanks,

Clay Daniels

Boot_Dawg on freenode irc channels #coreboot & #flashrom