+ *
+ * Copyright 2026 9elements.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "hw/arm/machines-qom.h"
+#include "hw/arm/aspeed.h"
+#include "hw/arm/aspeed_soc.h"
+#include "hw/nvram/eeprom_at24c.h"
+#include "hw/i2c/i2c_mux_pca954x.h"
+#include "hw/gpio/pca9552.h"
+
+#define FBY4_BMC_RAM_SIZE ASPEED_RAM_SIZE(2 * GiB)
+
+/* START OF EEPROM CONTENTS */
+
+/*
+ *./frugen -s board.mfg="Wiwynn" \
+ * --set board.pname="Fan Board FSC-MAX ADC-TI LED-NXP EFUSE-MAX" \
+ * --set text:board.pn="BRD-PN-345" \
+ * --board-date "10/1/2017 12:58:00" \
+ * --set board.serial="123456" \
+ * --set product.pname="Yosemite V4" \
+ * --set product.mfg="Wiwynn" \
+ * --set product.ver="v1.1" \
+ * --set product.serial="123456" \
+ * --set product.atag="PLACEHOLDER" \
+ * --set product.custom="Fanboard Custom1" \
+ * --set product.custom.1="Fanboard Custom2" \
+ * --set text:product.pn="PN-345" \
+ * fru-yv4-fanboard.bin
+ */
+/* EM Config: yosemite4_fanboard_fsc_max_adc_ti_led_nxp_ons_efuse_max.json */
+/* Yosemite4 fan board */
+static const uint8_t fru_yv4_fanboard_bin[] = {
+ 0x01, 0x00, 0x00, 0x01, 0x0b, 0x00, 0x00, 0xf3, 0x01, 0x0a, 0x19, 0xce,
+ 0xc2, 0xa8, 0xc6, 0x57, 0x69, 0x77, 0x79, 0x6e, 0x6e, 0xea, 0x46, 0x61,
+ 0x6e, 0x20, 0x42, 0x6f, 0x61, 0x72, 0x64, 0x20, 0x46, 0x53, 0x43, 0x2d,
+ 0x4d, 0x41, 0x58, 0x20, 0x41, 0x44, 0x43, 0x2d, 0x54, 0x49, 0x20, 0x4c,
+ 0x45, 0x44, 0x2d, 0x4e, 0x58, 0x50, 0x20, 0x45, 0x46, 0x55, 0x53, 0x45,
+ 0x2d, 0x4d, 0x41, 0x58, 0x85, 0x91, 0x34, 0x51, 0x95, 0x05, 0xca, 0x42,
+ 0x52, 0x44, 0x2d, 0x50, 0x4e, 0x2d, 0x33, 0x34, 0x35, 0xc0, 0xc1, 0x00,
+ 0x00, 0x00, 0x00, 0xdb, 0x01, 0x09, 0x19, 0xc6, 0x57, 0x69, 0x77, 0x79,
+ 0x6e, 0x6e, 0xcb, 0x59, 0x6f, 0x73, 0x65, 0x6d, 0x69, 0x74, 0x65, 0x20,
+ 0x56, 0x34, 0xc6, 0x50, 0x4e, 0x2d, 0x33, 0x34, 0x35, 0xc4, 0x76, 0x31,
+ 0x2e, 0x31, 0x85, 0x91, 0x34, 0x51, 0x95, 0x05, 0x89, 0x30, 0x1b, 0x8e,
+ 0x25, 0xfa, 0xb2, 0x64, 0x29, 0x03, 0xc0, 0xd0, 0x46, 0x61, 0x6e, 0x62,
+ 0x6f, 0x61, 0x72, 0x64, 0x20, 0x43, 0x75, 0x73, 0x74, 0x6f, 0x6d, 0x32,
+ 0xc1, 0x00, 0x00, 0x9d
+};
+static const size_t fru_yv4_fanboard_bin_len = sizeof(fru_yv4_fanboard_bin);
+
+/*
+ *./frugen -s board.mfg="Wiwynn" \
+ * --set board.pname="Sentinel Dome without Retimer" \
+ * --set text:board.pn="BRD-PN-345" \
+ * --board-date "10/1/2017 12:58:00" \
+ * --set board.serial="123456" \
+ * --set product.pname="Yosemite V4" \
+ * --set product.mfg="Wiwynn" \
+ * --set product.ver="v1.1" \
+ * --set product.serial="123456" \
+ * --set product.atag="PLACEHOLDER" \
+ * --set product.custom="Yosemite V4 T1" \
+ * --set product.custom.1="Yosemite V4 T1" \
+ * --set text:product.pn="PN-345" \
+ * fru-yv4-sentineldome-board.bin
+ */
+/* product.cust maps to PRODUCT_INFO_AM2 */
+/* EM Config: yosemite4_sentineldome_t1.json */
+/* Yosemite4 Sentinel Dome without Retimer Boards */
+static const uint8_t fru_yv4_sentineldome_board_bin[] = {
+ 0x01, 0x00, 0x00, 0x01, 0x09, 0x00, 0x00, 0xf5, 0x01, 0x08, 0x19, 0xce,
+ 0xc2, 0xa8, 0xc6, 0x57, 0x69, 0x77, 0x79, 0x6e, 0x6e, 0xdd, 0x53, 0x65,
+ 0x6e, 0x74, 0x69, 0x6e, 0x65, 0x6c, 0x20, 0x44, 0x6f, 0x6d, 0x65, 0x20,
+ 0x77, 0x69, 0x74, 0x68, 0x6f, 0x75, 0x74, 0x20, 0x52, 0x65, 0x74, 0x69,
+ 0x6d, 0x65, 0x72, 0x85, 0x91, 0x34, 0x51, 0x95, 0x05, 0xca, 0x42, 0x52,
+ 0x44, 0x2d, 0x50, 0x4e, 0x2d, 0x33, 0x34, 0x35, 0xc0, 0xc1, 0x00, 0x78,
+ 0x01, 0x09, 0x19, 0xc6, 0x57, 0x69, 0x77, 0x79, 0x6e, 0x6e, 0xcb, 0x59,
+ 0x6f, 0x73, 0x65, 0x6d, 0x69, 0x74, 0x65, 0x20, 0x56, 0x34, 0xc6, 0x50,
+ 0x4e, 0x2d, 0x33, 0x34, 0x35, 0xc4, 0x76, 0x31, 0x2e, 0x31, 0x85, 0x91,
+ 0x34, 0x51, 0x95, 0x05, 0x89, 0x30, 0x1b, 0x8e, 0x25, 0xfa, 0xb2, 0x64,
+ 0x29, 0x03, 0xc0, 0xce, 0x59, 0x6f, 0x73, 0x65, 0x6d, 0x69, 0x74, 0x65,
+ 0x20, 0x56, 0x34, 0x20, 0x54, 0x31, 0xc1, 0x00, 0x00, 0x00, 0x00, 0xeb
+};
+static const size_t fru_yv4_sentineldome_board_bin_len =
+ sizeof(fru_yv4_sentineldome_board_bin);
+
+/*
+ *./frugen -s board.mfg="Wiwynn" \
+ * --set board.pname="Sentinel Dome" \
+ * --set text:board.pn="BRD-PN-345" \
+ * --board-date "10/1/2017 12:58:00" \
+ * --set board.serial="123456" \
+ * --set product.pname="Yosemite V4" \
+ * --set product.mfg="Wiwynn" \
+ * --set product.ver="v1.1" \
+ * --set product.serial="123456" \
+ * --set product.atag="PLACEHOLDER" \
+ * --set text:product.pn="PN-345" \
+ * fru-yv4-sentineldome-chassis.bin
+ */
+/* EM Config: yosemite4_sentineldome_chassis.json */
+/* Yosemite 4 Sentinel Dome Chassis FRU */
+static const uint8_t fru_yv4_sentineldome_chassis_bin[] = {
+ 0x01, 0x00, 0x00, 0x01, 0x07, 0x00, 0x00, 0xf7, 0x01, 0x06, 0x19, 0xce,
+ 0xc2, 0xa8, 0xc6, 0x57, 0x69, 0x77, 0x79, 0x6e, 0x6e, 0xcd, 0x53, 0x65,
+ 0x6e, 0x74, 0x69, 0x6e, 0x65, 0x6c, 0x20, 0x44, 0x6f, 0x6d, 0x65, 0x85,
+ 0x91, 0x34, 0x51, 0x95, 0x05, 0xca, 0x42, 0x52, 0x44, 0x2d, 0x50, 0x4e,
+ 0x2d, 0x33, 0x34, 0x35, 0xc0, 0xc1, 0x00, 0xb6, 0x01, 0x07, 0x19, 0xc6,
+ 0x57, 0x69, 0x77, 0x79, 0x6e, 0x6e, 0xcb, 0x59, 0x6f, 0x73, 0x65, 0x6d,
+ 0x69, 0x74, 0x65, 0x20, 0x56, 0x34, 0xc6, 0x50, 0x4e, 0x2d, 0x33, 0x34,
+ 0x35, 0xc4, 0x76, 0x31, 0x2e, 0x31, 0x85, 0x91, 0x34, 0x51, 0x95, 0x05,
+ 0x89, 0x30, 0x1b, 0x8e, 0x25, 0xfa, 0xb2, 0x64, 0x29, 0x03, 0xc0, 0xc1,
+ 0x00, 0x00, 0x00, 0x59
+};
+static const size_t fru_yv4_sentineldome_chassis_bin_len =
+ sizeof(fru_yv4_sentineldome_chassis_bin);
+
+/*
+ *./frugen -s board.mfg="Wiwynn" \
+ * --set board.pname="Management Board wBMC" \
+ * --set text:board.pn="BRD-PN-345" \
+ * --board-date "10/1/2017 12:58:00" \
+ * --set board.serial="123456" \
+ * --set product.pname="Yosemite V4" \
+ * --set product.mfg="Wiwynn" \
+ * --set product.ver="v1.1" \
+ * --set product.serial="123456" \
+ * --set product.atag="PLACEHOLDER" \
+ * --set text:product.pn="PN-345" \
+ * fru-yv4-eclosure.bin
+ */
+/* EM Config: yosemite4_chassis.json, yosemite4.json */
+/* Yosemite 4 Sentinel Dome Enclosure FRU */
+static const uint8_t fru_yv4_eclosure_bin[] = {
+ 0x01, 0x00, 0x00, 0x01, 0x08, 0x00, 0x00, 0xf6, 0x01, 0x07, 0x19, 0xce,
+ 0xc2, 0xa8, 0xc6, 0x57, 0x69, 0x77, 0x79, 0x6e, 0x6e, 0xd5, 0x4d, 0x61,
+ 0x6e, 0x61, 0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x20, 0x42, 0x6f, 0x61,
+ 0x72, 0x64, 0x20, 0x77, 0x42, 0x4d, 0x43, 0x85, 0x91, 0x34, 0x51, 0x95,
+ 0x05, 0xca, 0x42, 0x52, 0x44, 0x2d, 0x50, 0x4e, 0x2d, 0x33, 0x34, 0x35,
+ 0xc0, 0xc1, 0x00, 0x26, 0x01, 0x07, 0x19, 0xc6, 0x57, 0x69, 0x77, 0x79,
+ 0x6e, 0x6e, 0xcb, 0x59, 0x6f, 0x73, 0x65, 0x6d, 0x69, 0x74, 0x65, 0x20,
+ 0x56, 0x34, 0xc6, 0x50, 0x4e, 0x2d, 0x33, 0x34, 0x35, 0xc4, 0x76, 0x31,
+ 0x2e, 0x31, 0x85, 0x91, 0x34, 0x51, 0x95, 0x05, 0x89, 0x30, 0x1b, 0x8e,
+ 0x25, 0xfa, 0xb2, 0x64, 0x29, 0x03, 0xc0, 0xc1, 0x00, 0x00, 0x00, 0x59
+};
+static const size_t fru_yv4_eclosure_bin_len = sizeof(fru_yv4_eclosure_bin);
+
+/* END OF EEPROM CONTENTS */
+
+static void fby4_i2c_init_fanboard(I2CSlave *fan_mux, size_t eepromSize)
+{
+ /* 2 fan boards */
+ for (int i = 0; i <= 1; i++) {
+ /* downstream bus */
+ I2CBus *bus = pca954x_i2c_get_bus(fan_mux, i);
+
+ /* ti,adc128d818 @ 0x1f (adc) */
+ /* TODO */
+
+ /* maxim,max31790 @ 0x20 (pwm) */
+ /* TODO */
+
+ /*
+ * ti,tca6424 @ 0x22 (gpio)
+ * linux handles tca6424 with PCA953X_TYPE, same as pca9535
+ * { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
+ * { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
+ * so we _could_ be fine here unless more than 16 gpios are used
+ */
+ i2c_slave_create_simple(bus, TYPE_PCA9535, 0x22);
+
+ /*
+ * NOTE: above works and could use for gpio presence:
+ * $ gpioget gpiochip2 2
+ * 1
+ */
+
+ /* maxim,max31790 @ 0x2f (pwm) */
+ /* TODO */
+
+ /* maxim,max11615 @ 0x33 (adc) */
+ /* TODO */
+
+ at24c_eeprom_init_rom(
+ bus, 0x52, eepromSize,
+ fru_yv4_fanboard_bin,
+ fru_yv4_fanboard_bin_len);
+
+ /* LED blink driver / gpio expander */
+ /* nxp,pca9552 @ 0x61 (gpio) */
+ i2c_slave_create_simple(bus, TYPE_PCA9552, 0x61);
+ }
+}
+
+static void fby4_i2c_init_blade_chassis(I2CBus *bus, size_t eepromSize)
+{
+ /* Sentinel Dome Blade EEPROMS */
+
+ /* Board */
+ at24c_eeprom_init_rom(bus, 0x54, eepromSize,
+ fru_yv4_sentineldome_board_bin, fru_yv4_sentineldome_board_bin_len);
+
+ /* Chassis */
+ at24c_eeprom_init_rom(bus, 0x55, eepromSize,
+ fru_yv4_sentineldome_chassis_bin, fru_yv4_sentineldome_chassis_bin_len);
+}
+
+static void fby4_i2c_init_multiple_blade_chassis(I2CBus **i2c,
+ size_t eepromSize)
+{
+ /* there is 8 blade chassis, but we only emulate 2 for performance reason
*/
+ for (int bus = 1; bus <= (8 / 4); bus++) {
+ fby4_i2c_init_blade_chassis(i2c[bus], eepromSize);
+ }
+}
+
+static void fby4_i2c_init(AspeedMachineState *bmc)
+{
+ AspeedSoCState *soc = bmc->soc;
+ I2CBus *i2c[16];
+
+ for (int i = 0; i < 16; i++) {
+ i2c[i] = aspeed_i2c_get_bus(&soc->i2c, i);
+ }
+
+ /* Enclosure (EM Config: yosemite4_chassis.json, yosemite4.json) */
+ at24c_eeprom_init_rom(i2c[1], 0x51, 128 * KiB,
+ fru_yv4_eclosure_bin, fru_yv4_eclosure_bin_len);
+
+ fby4_i2c_init_multiple_blade_chassis(i2c, 128 * KiB);
+
+ /* Yv4 fanboard connection */
+ I2CSlave *fan_mux = i2c_slave_create_simple(i2c[14], TYPE_PCA9546, 0x74);
+
+ fby4_i2c_init_fanboard(fan_mux, 128 * KiB);
+}
+
+static void aspeed_machine_fby4_class_init(ObjectClass *oc, const void *data)
+{
+ MachineClass *mc = MACHINE_CLASS(oc);
+ AspeedMachineClass *amc = ASPEED_MACHINE_CLASS(oc);
+
+ mc->desc = "Facebook fby4 BMC (Cortex-A7)";
+ amc->fmc_model = "mx66l1g45g";
+ amc->num_cs = 2;
+ amc->macs_mask = ASPEED_MAC3_ON;
+ amc->i2c_init = fby4_i2c_init;
+ mc->default_ram_size = FBY4_BMC_RAM_SIZE;
+ aspeed_machine_class_init_cpus_defaults(mc);
+}
+
+static const TypeInfo aspeed_ast2600_fby4_types[] = {
+ {
+ .name = MACHINE_TYPE_NAME("fby4-bmc"),
+ .parent = MACHINE_TYPE_NAME("ast2600-evb"),
+ .class_init = aspeed_machine_fby4_class_init,
+ .interfaces = arm_machine_interfaces,
+ }
+};
+
+DEFINE_TYPES(aspeed_ast2600_fby4_types)
diff --git a/hw/arm/meson.build b/hw/arm/meson.build
index 84b8ec5fb5..ccbc23e549 100644
--- a/hw/arm/meson.build
+++ b/hw/arm/meson.build
@@ -60,6 +60,7 @@ arm_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files(
'aspeed_ast2600_catalina.c',
'aspeed_ast2600_evb.c',
'aspeed_ast2600_fby35.c',
+ 'aspeed_ast2600_fby4.c',
'aspeed_ast2600_fuji.c',
'aspeed_ast2600_gb200nvl.c',
'aspeed_ast2600_qcom-dc-scm-v1.c',
