SMBIOS tables missing on 2025.04-rc5 on qemu-x86

[Niklas Sombert]

Hi all,






This is pretty easy to reproduce:

git checkout v2025.01
make clean
git clean -xf
make qemu-x86_defconfig
# edit .config: CONFIG_CMD_SMBIOS=y
make -j4
qemu-system-i386 -bios u-boot.rom
# type "smbios" in the prompt and see information about the system

versus:
git checkout v2025.04-rc5
make clean
git clean -xf
make qemu-x86_defconfig
# edit .config: CONFIG_CMD_SMBIOS=y
make -j4
qemu-system-i386 -bios u-boot.rom
# type "smbios" and get the following error:
# do_smbios() Unknown SMBIOS anchor format



Bisecting leads me to the following commit:

commit d5bc5c6cb0291203fe848a8532a7ecbcd44cfe9e
Author: Simon Glass <s...@chromium.org>
Date:   Fri Jan 10 17:00:26 2025 -0700

    x86: emulation: Enable bloblist

    Add bloblist support so that tables can be generated and placed in a
    bloblist, then passed to a payload using UPL

    Signed-off-by: Simon Glass <s...@chromium.org>

diff --git a/configs/qemu-x86_64_defconfig b/configs/qemu-x86_64_defconfig
index 2771a4b9e19..792ba06c2b8 100644
--- a/configs/qemu-x86_64_defconfig
+++ b/configs/qemu-x86_64_defconfig
@@ -1,6 +1,7 @@
 CONFIG_X86=y
 CONFIG_TEXT_BASE=0x1110000
 CONFIG_SYS_MALLOC_F_LEN=0x1000
+CONFIG_BLOBLIST_SIZE_RELOC=0x20000
 CONFIG_NR_DRAM_BANKS=8
 CONFIG_ENV_SIZE=0x40000
 CONFIG_MAX_CPUS=2
@@ -33,6 +34,7 @@ CONFIG_LOGF_FUNC=y
 CONFIG_SPL_LOG=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_PCI_INIT_R=y
+CONFIG_BLOBLIST=y
 CONFIG_BLOBLIST_FIXED=y
 CONFIG_BLOBLIST_ADDR=0x10000
 CONFIG_SPL_NO_BSS_LIMIT=y
diff --git a/configs/qemu-x86_defconfig b/configs/qemu-x86_defconfig
index 947d15cd727..0b0e10c795f 100644
--- a/configs/qemu-x86_defconfig
+++ b/configs/qemu-x86_defconfig
@@ -1,6 +1,7 @@
 CONFIG_X86=y
 CONFIG_TEXT_BASE=0xFFF00000
 CONFIG_SYS_MALLOC_F_LEN=0x1000
+CONFIG_BLOBLIST_SIZE_RELOC=0x20000
 CONFIG_NR_DRAM_BANKS=8
 CONFIG_ENV_SIZE=0x40000
 CONFIG_MAX_CPUS=2
@@ -23,6 +24,9 @@ CONFIG_LOG=y
 CONFIG_LOGF_FUNC=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_PCI_INIT_R=y
+CONFIG_BLOBLIST=y
+CONFIG_BLOBLIST_FIXED=y
+CONFIG_BLOBLIST_ADDR=0x10000
 CONFIG_CMD_CPU=y
 CONFIG_CMD_BOOTEFI_SELFTEST=y
 CONFIG_CMD_NVEDIT_EFI=y

Just setting CONFIG_BLOBLIST=n solves this problem for me.


ld.bfd: arch/x86/lib/tables.o: in function `write_tables':



Greetings,
Niklas

I've written a small EFI bootloader and I'm testing it on QEMU with OVMF and with u-boot (with the qemu-x86_defconfig as -bios in QEMU). On upgrading from 2025.01 to 2025.04-rc5, I've noticed that the SMBIOS tables that are passed via the SMBIOS EFI config table are completely blank (just zeroes instead of starting with SM3). This is on QEMU version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.25), the one Ubuntu 22.04 currently ships, but I also get the same results on Ubuntu 24.04. I'm not sure how to debug this further, because v2025.01 doesn't build with the config from v2025.04-rc5: /home/niklas/Build/u-boot/arch/x86/lib/tables.c:171: undefined reference to `acpi_write_rsdp'

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