The fby35 machine includes 4 server boards, each of which has a "bridge interconnect" (BIC). This chip abstracts the pinout for the server board into a single endpoint that the baseboard management controller (BMC) can talk to using IPMB.
The codename for this board is oby35-cl, which means "OpenBIC Yosemite3.5 CraterLake". There is also a variant of the BIC called "OpenBIC Yosemite3.5 Baseboard", which is an image built to run from the baseboard as a replacement for the BMC, that's not included here, but that's why the "-cl" suffix is included. A test image can be built from https://github.com/facebook/openbic using the instructions in the README.md to build the meta-facebook/yv35-cl recipe, or retrieved from my Github: wget https://github.com/peterdelevoryas/OpenBIC/releases/download/oby35-cl-2022.17.01/Y35BCL.elf And you can run this machine with the following command: qemu-system-arm -machine oby35-cl -nographic -kernel Y35BCL.elf It should produce output like the following: [00:00:00.008,000] <inf> usb_dc_aspeed: select ep[0x81] as IN endpoint [00:00:00.009,000] <inf> usb_dc_aspeed: select ep[0x82] as IN endpoint [00:00:00.009,000] <wrn> usb_dc_aspeed: pre-selected ep[0x1] as IN endpoint [00:00:00.009,000] <wrn> usb_dc_aspeed: pre-selected ep[0x2] as IN endpoint [00:00:00.009,000] <inf> usb_dc_aspeed: select ep[0x3] as OUT endpoint *** Booting Zephyr OS build v00.01.05 *** Hello, welcome to yv35 craterlake 2022.25.1 BIC class type(class-1), 1ou present status(0), 2ou present status(0), board revision(0x1) [init_drive_type] sensor 0x14 post sensor read failed! [init_drive_type] sensor 0x30 post sensor read failed! [init_drive_type] sensor 0x39 post sensor read failed! ipmi_init [set_DC_status] gpio number(15) status(0) [set_post_status] gpio number(1) status(1) uart:~$ [00:00:00.249,000] <inf> kcs_aspeed: KCS3: addr=0xca2, idr=0x2c, odr=0x38, str=0x44 [00:00:00.255,000] <err> spi_nor_multi_dev: [1216][spi1_cs0]SFDP magic 00000000 invalid [00:00:00.255,000] <err> spi_nor_multi_dev: [1456]SFDP read failed: -22 [00:00:00.249,000] <inf> kcs_aspeed: KCS3: addr=0xca2, idr=0x2c, odr=0x38, str=0x44 [00:00:00.255,000] <err> spi_nor_multi_dev: [1216][spi1_cs0]SFDP magic 00000000 invalid [00:00:00.255,000] <err> spi_nor_multi_dev: [1456]SFDP read failed: -22 uart:~$ BIC Ready Signed-off-by: Peter Delevoryas <p...@fb.com> --- hw/arm/aspeed.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c index a06f7c1b62..75971ef2ca 100644 --- a/hw/arm/aspeed.c +++ b/hw/arm/aspeed.c @@ -1429,6 +1429,50 @@ static void aspeed_minibmc_machine_ast1030_evb_class_init(ObjectClass *oc, amc->macs_mask = 0; } +static void oby35_cl_i2c_init(AspeedMachineState *bmc) +{ + AspeedSoCState *soc = &bmc->soc; + I2CBus *i2c[14]; + I2CBus *ssd[8]; + int i; + + for (i = 0; i < 14; i++) { + i2c[i] = aspeed_i2c_get_bus(&soc->i2c, i); + } + get_pca9548_channels(i2c[1], 0x71, ssd); + + i2c_slave_create_simple(i2c[0], "fby35-sb-cpld", 0x21); + i2c_slave_create_simple(i2c[1], "tmp105", 0x48); + i2c_slave_create_simple(i2c[1], "tmp105", 0x49); + i2c_slave_create_simple(i2c[1], "tmp105", 0x4a); + i2c_slave_create_simple(i2c[1], "adm1272", 0x40); + i2c_slave_create_simple(i2c[1], "tmp421", 0x4c); + i2c_slave_create_simple(i2c[2], "intel-me", 0x16); + i2c_slave_create_simple(i2c[4], "isl69259", 0x76); + i2c_slave_create_simple(i2c[4], "isl69259", 0x62); + i2c_slave_create_simple(i2c[4], "isl69259", 0x60); + + for (int i = 0; i < 8; i++) { + i2c_slave_create_simple(ssd[i], "tmp105", 0x6a); + } + + /* + * FIXME: This should actually be the BMC, but both the ME and the BMC + * are IPMB endpoints, and the current ME implementation is generic + * enough to respond normally to some things. + */ + i2c_slave_create_simple(i2c[6], "intel-me", 0x10); +} + +static void aspeed_machine_oby35_cl_class_init(ObjectClass *oc, void *data) +{ + MachineClass *mc = MACHINE_CLASS(oc); + AspeedMachineClass *amc = ASPEED_MACHINE_CLASS(oc); + + mc->desc = "Meta Platforms fby35 CraterLake BIC (Cortex-M4)"; + amc->i2c_init = oby35_cl_i2c_init; +} + static const TypeInfo aspeed_machine_types[] = { { .name = MACHINE_TYPE_NAME("palmetto-bmc"), @@ -1494,6 +1538,10 @@ static const TypeInfo aspeed_machine_types[] = { .name = MACHINE_TYPE_NAME("ast1030-evb"), .parent = TYPE_ASPEED_MACHINE, .class_init = aspeed_minibmc_machine_ast1030_evb_class_init, + }, { + .name = MACHINE_TYPE_NAME("oby35-cl"), + .parent = MACHINE_TYPE_NAME("ast1030-evb"), + .class_init = aspeed_machine_oby35_cl_class_init, }, { .name = TYPE_ASPEED_MACHINE, .parent = TYPE_MACHINE, -- 2.30.2