@samitouri / QOSamiQemu / commits / 34f634a207

hw/arm: Remove fby35 machine

The fby35 machine was deprecated in QEMU 10.2 and is now removed in QEMU 11.1. This multi-SoC machine was added as an example of heterogeneous systems, but the models never evolved and no public firmware is available to boot it. Users needing multi-SoC emulation should use the ast2700fc machine instead, which is based on newer AST2700 SoCs with better support. Link: https://lore.kernel.org/qemu-devel/20260510165704.2935316-5-clg@redhat.com Acked-by: Peter Delevoryas <peter@pjd.dev> Signed-off-by: Cédric Le Goater <clg@redhat.com>

Cédric Le Goater committed May 10, 2026 at 18:57 UTC 34f634a20721bbe12a58c4c6d0b22d1df4da9154

7 files changed +11 -270

MAINTAINERS

-2

@@ -1276,12 +1276,10 @@ F: include/hw/*/*aspeed*

1276 F: hw/net/ftgmac100.c

1277 F: include/hw/net/ftgmac100.h

1278 F: docs/system/arm/aspeed.rst

1279 -F: docs/system/arm/fby35.rst

1279 F: docs/specs/aspeed*

1280 F: tests/functional/*/*aspeed*

1281 F: tests/*/*aspeed*

1282 F: tests/*/*ast2700*

1284 -F: hw/arm/fby35.c

1283 F: pc-bios/ast27x0_bootrom.bin

1284 F: roms/vbootrom

1285

docs/about/deprecated.rst

-10

@@ -250,16 +250,6 @@ deprecated; use the new name ``dtb-randomness`` instead. The new name

250 better reflects the way this property affects all random data within

251 the device tree blob, not just the ``kaslr-seed`` node.

252

253 -Arm ``fby35`` machine (since 10.2)

254 -''''''''''''''''''''''''''''''''''

255 -

256 -The ``fby35`` machine was originally added as an example of a

257 -multi-SoC system, with the expectation the models would evolve over

258 -time in an heterogeneous system. This hasn't happened and no public

259 -firmware is available to boot it. It can be replaced by the

260 -``ast2700fc``, another multi-SoC machine based on the newer AST2700

261 -SoCs which are excepted to receive better support in the future.

262 -

253

254 RISC-V default machine option (since 10.0)

255 ''''''''''''''''''''''''''''''''''''''''''

docs/about/removed-features.rst

+10

@@ -1213,6 +1213,16 @@ models, it can be replaced by the ``ast2500-evb`` machine using the

1213 ``fmc-model`` option to specify the flash type. The I2C devices

1214 connected to the board can be defined via the QEMU command line.

1215

1216 +Arm ``fby35`` machine (removed in 11.1)

1217 +'''''''''''''''''''''''''''''''''''''''

1218 +

1219 +The ``fby35`` machine was originally added as an example of a

1220 +multi-SoC system, with the expectation the models would evolve over

1221 +time in an heterogeneous system. This hasn't happened and no public

1222 +firmware is available to boot it. It can be replaced by the

1223 +``ast2700fc``, another multi-SoC machine based on the newer AST2700

1224 +SoCs which are excepted to receive better support in the future.

1225 +

1226 linux-user mode CPUs

1227 --------------------

1228

docs/system/arm/fby35.rst deleted

-52

@@ -1,52 +0,0 @@

1 -Facebook Yosemite v3.5 Platform and CraterLake Server (``fby35``)

2 -==================================================================

3 -

4 -Facebook has a series of multi-node compute server designs named

5 -Yosemite. The most recent version released was

6 -`Yosemite v3 <https://www.opencompute.org/documents/ocp-yosemite-v3-platform-design-specification-1v16-pdf>`__.

7 -

8 -Yosemite v3.5 is an iteration on this design, and is very similar: there's a

9 -baseboard with a BMC, and 4 server slots. The new server board design termed

10 -"CraterLake" includes a Bridge IC (BIC), with room for expansion boards to

11 -include various compute accelerators (video, inferencing, etc). At the moment,

12 -only the first server slot's BIC is included.

13 -

14 -Yosemite v3.5 is itself a sled which fits into a 40U chassis, and 3 sleds

15 -can be fit into a chassis. See `here <https://www.opencompute.org/products-chiplets/237/wiwynn-yosemite-v3-server>`__

16 -for an example.

17 -

18 -In this generation, the BMC is an AST2600 and each BIC is an AST1030. The BMC

19 -runs `OpenBMC <https://github.com/facebook/openbmc>`__, and the BIC runs

20 -`OpenBIC <https://github.com/facebook/openbic>`__.

21 -

22 -Firmware images can be retrieved from the Github releases or built from the

23 -source code, see the README's for instructions on that. This image uses the

24 -"fby35" machine recipe from OpenBMC, and the "yv35-cl" target from OpenBIC.

25 -Some reference images can also be found here:

26 -

27 -.. code-block:: bash

28 -

29 - $ wget https://github.com/facebook/openbmc/releases/download/openbmc-e2294ff5d31d/fby35.mtd

30 - $ wget https://github.com/peterdelevoryas/OpenBIC/releases/download/oby35-cl-2022.13.01/Y35BCL.elf

31 -

32 -Since this machine has multiple SoC's, each with their own serial console, the

33 -recommended way to run it is to allocate a pseudoterminal for each serial

34 -console and let the monitor use stdio. Also, starting in a paused state is

35 -useful because it allows you to attach to the pseudoterminals before the boot

36 -process starts.

37 -

38 -.. code-block:: bash

39 -

40 - $ qemu-system-arm -machine fby35 \

41 - -drive file=fby35.mtd,format=raw,if=mtd \

42 - -device loader,file=Y35BCL.elf,addr=0,cpu-num=2 \

43 - -serial pty -serial pty -serial mon:stdio \

44 - -display none -S

45 - $ screen /dev/tty0 # In a separate TMUX pane, terminal window, etc.

46 - $ screen /dev/tty1

47 - $ (qemu) c # Start the boot process once screen is setup.

48 -

49 -This machine model supports emulation of the boot from the CE0 flash device by

50 -setting option ``execute-in-place``. When using this option, the CPU fetches

51 -instructions to execute by reading CE0 and not from a preloaded ROM

52 -initialized at machine init time. As a result, execution will be slower.

docs/system/target-arm.rst

-1

@@ -87,7 +87,6 @@ Board-specific documentation

87 arm/cubieboard

88 arm/emcraft-sf2

89 arm/exynos

90 - arm/fby35

90 arm/musicpal

91 arm/kzm

92 arm/nrf

hw/arm/fby35.c deleted

-203

@@ -1,203 +0,0 @@

1 -/*

2 - * Copyright (c) Meta Platforms, Inc. and affiliates. (http://www.meta.com)

3 - *

4 - * This code is licensed under the GPL version 2 or later. See the COPYING

5 - * file in the top-level directory.

6 - */

7 -

8 -#include "qemu/osdep.h"

9 -#include "qemu/units.h"

10 -#include "qapi/error.h"

11 -#include "system/system.h"

12 -#include "system/block-backend.h"

13 -#include "hw/core/boards.h"

14 -#include "hw/core/qdev-clock.h"

15 -#include "hw/arm/aspeed_soc.h"

16 -#include "hw/arm/boot.h"

17 -#include "hw/arm/machines-qom.h"

18 -

19 -#define TYPE_FBY35 MACHINE_TYPE_NAME("fby35")

20 -OBJECT_DECLARE_SIMPLE_TYPE(Fby35State, FBY35);

21 -

22 -struct Fby35State {

23 - MachineState parent_obj;

24 -

25 - MemoryRegion bmc_memory;

26 - MemoryRegion bmc_dram;

27 - MemoryRegion bmc_boot_rom;

28 - MemoryRegion bic_memory;

29 - Clock *bic_sysclk;

30 -

31 - Aspeed2600SoCState bmc;

32 - Aspeed10x0SoCState bic;

33 -

34 - bool mmio_exec;

35 -};

36 -

37 -#define FBY35_BMC_RAM_SIZE (2 * GiB)

38 -#define FBY35_BMC_FIRMWARE_ADDR 0x0

39 -

40 -static void fby35_bmc_write_boot_rom(DriveInfo *dinfo, MemoryRegion *mr,

41 - hwaddr offset, size_t rom_size,

42 - Error **errp)

43 -{

44 - BlockBackend *blk = blk_by_legacy_dinfo(dinfo);

45 - g_autofree void *storage = NULL;

46 - int64_t size;

47 -

48 - /*

49 - * The block backend size should have already been 'validated' by

50 - * the creation of the m25p80 object.

51 - */

52 - size = blk_getlength(blk);

53 - if (size <= 0) {

54 - error_setg(errp, "failed to get flash size");

55 - return;

56 - }

57 -

58 - if (rom_size > size) {

59 - rom_size = size;

60 - }

61 -

62 - storage = g_malloc0(rom_size);

63 - if (blk_pread(blk, 0, rom_size, storage, 0) < 0) {

64 - error_setg(errp, "failed to read the initial flash content");

65 - return;

66 - }

67 -

68 - /* TODO: find a better way to install the ROM */

69 - memcpy(memory_region_get_ram_ptr(mr) + offset, storage, rom_size);

70 -}

71 -

72 -static void fby35_bmc_init(Fby35State *s)

73 -{

74 - AspeedSoCState *soc;

75 - AspeedSoCClass *sc;

76 -

77 - object_initialize_child(OBJECT(s), "bmc", &s->bmc, "ast2600-a3");

78 - soc = ASPEED_SOC(&s->bmc);

79 - sc = ASPEED_SOC_GET_CLASS(soc);

80 -

81 - memory_region_init(&s->bmc_memory, OBJECT(&s->bmc), "bmc-memory",

82 - UINT64_MAX);

83 - memory_region_add_subregion(get_system_memory(), 0, &s->bmc_memory);

84 - memory_region_init_ram(&s->bmc_dram, OBJECT(&s->bmc), "bmc-dram",

85 - FBY35_BMC_RAM_SIZE, &error_abort);

86 -

87 - object_property_set_int(OBJECT(&s->bmc), "ram-size", FBY35_BMC_RAM_SIZE,

88 - &error_abort);

89 - object_property_set_link(OBJECT(&s->bmc), "memory", OBJECT(&s->bmc_memory),

90 - &error_abort);

91 - object_property_set_link(OBJECT(&s->bmc), "dram", OBJECT(&s->bmc_dram),

92 - &error_abort);

93 - object_property_set_int(OBJECT(&s->bmc), "hw-strap1", 0x000000C0,

94 - &error_abort);

95 - object_property_set_int(OBJECT(&s->bmc), "hw-strap2", 0x00000003,

96 - &error_abort);

97 - aspeed_soc_uart_set_chr(soc->uart, ASPEED_DEV_UART5, sc->uarts_base,

98 - sc->uarts_num, serial_hd(0));

99 - qdev_realize(DEVICE(&s->bmc), NULL, &error_abort);

100 -

101 - aspeed_board_init_flashes(&soc->fmc, "n25q00", 2, 0);

102 -

103 - /* Install first FMC flash content as a boot rom. */

104 - if (!s->mmio_exec) {

105 - DriveInfo *mtd0 = drive_get(IF_MTD, 0, 0);

106 -

107 - if (mtd0) {

108 - uint64_t rom_size = memory_region_size(&soc->spi_boot);

109 -

110 - memory_region_init_rom(&s->bmc_boot_rom, NULL, "aspeed.boot_rom",

111 - rom_size, &error_abort);

112 - memory_region_add_subregion_overlap(&soc->spi_boot_container, 0,

113 - &s->bmc_boot_rom, 1);

114 -

115 - fby35_bmc_write_boot_rom(mtd0, &s->bmc_boot_rom,

116 - FBY35_BMC_FIRMWARE_ADDR,

117 - rom_size, &error_abort);

118 - }

119 - }

120 -}

121 -

122 -static void fby35_bic_init(Fby35State *s)

123 -{

124 - AspeedSoCState *soc;

125 - AspeedSoCClass *sc;

126 -

127 - s->bic_sysclk = clock_new(OBJECT(s), "SYSCLK");

128 - clock_set_hz(s->bic_sysclk, 200000000ULL);

129 -

130 - object_initialize_child(OBJECT(s), "bic", &s->bic, "ast1030-a1");

131 - soc = ASPEED_SOC(&s->bic);

132 - sc = ASPEED_SOC_GET_CLASS(soc);

133 -

134 - memory_region_init(&s->bic_memory, OBJECT(&s->bic), "bic-memory",

135 - UINT64_MAX);

136 -

137 - qdev_connect_clock_in(DEVICE(&s->bic), "sysclk", s->bic_sysclk);

138 - object_property_set_link(OBJECT(&s->bic), "memory", OBJECT(&s->bic_memory),

139 - &error_abort);

140 - aspeed_soc_uart_set_chr(soc->uart, ASPEED_DEV_UART5, sc->uarts_base,

141 - sc->uarts_num, serial_hd(1));

142 - qdev_realize(DEVICE(&s->bic), NULL, &error_abort);

143 -

144 - aspeed_board_init_flashes(&soc->fmc, "sst25vf032b", 2, 2);

145 - aspeed_board_init_flashes(&soc->spi[0], "sst25vf032b", 2, 4);

146 - aspeed_board_init_flashes(&soc->spi[1], "sst25vf032b", 2, 6);

147 -}

148 -

149 -static void fby35_init(MachineState *machine)

150 -{

151 - Fby35State *s = FBY35(machine);

152 -

153 - fby35_bmc_init(s);

154 - fby35_bic_init(s);

155 -}

156 -

157 -

158 -static bool fby35_get_mmio_exec(Object *obj, Error **errp)

159 -{

160 - return FBY35(obj)->mmio_exec;

161 -}

162 -

163 -static void fby35_set_mmio_exec(Object *obj, bool value, Error **errp)

164 -{

165 - FBY35(obj)->mmio_exec = value;

166 -}

167 -

168 -static void fby35_instance_init(Object *obj)

169 -{

170 - FBY35(obj)->mmio_exec = false;

171 -}

172 -

173 -static void fby35_class_init(ObjectClass *oc, const void *data)

174 -{

175 - MachineClass *mc = MACHINE_CLASS(oc);

176 -

177 - mc->desc = "Meta Platforms fby35";

178 - mc->deprecation_reason = "For a multi-soc machine, use 'ast2700fc' instead";

179 - mc->init = fby35_init;

180 - mc->no_floppy = 1;

181 - mc->no_cdrom = 1;

182 - mc->auto_create_sdcard = true;

183 - mc->min_cpus = mc->max_cpus = mc->default_cpus = 3;

184 -

185 - object_class_property_add_bool(oc, "execute-in-place",

186 - fby35_get_mmio_exec,

187 - fby35_set_mmio_exec);

188 - object_class_property_set_description(oc, "execute-in-place",

189 - "boot directly from CE0 flash device");

190 -}

191 -

192 -static const TypeInfo fby35_types[] = {

193 - {

194 - .name = MACHINE_TYPE_NAME("fby35"),

195 - .parent = TYPE_MACHINE,

196 - .class_init = fby35_class_init,

197 - .instance_size = sizeof(Fby35State),

198 - .instance_init = fby35_instance_init,

199 - .interfaces = arm_machine_interfaces,

200 - },

201 -};

202 -

203 -DEFINE_TYPES(fby35_types);

hw/arm/meson.build

+1 -2

@@ -62,8 +62,7 @@ arm_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files(

62 'aspeed_ast2600_gb200nvl.c',

63 'aspeed_ast2600_rainier.c',

64 'aspeed_ast10x0.c',

65 - 'aspeed_ast10x0_evb.c',

66 - 'fby35.c'))

65 + 'aspeed_ast10x0_evb.c'))

66 arm_common_ss.add(when: ['CONFIG_ASPEED_SOC', 'TARGET_AARCH64'], if_true: files(

67 'aspeed_ast1700.c',

68 'aspeed_ast27x0.c',