u-boot.git/lib/Kconfig, branch v2025.07

uthread: add cooperative multi-tasking interface

2025-04-23T19:19:44+00:00

Add a new internal API called uthread (Kconfig symbol: UTHREAD) which
provides cooperative multi-tasking. The goal is to be able to improve
the performance of some parts of U-Boot by overlapping lengthy
operations, and also implement background jobs in the U-Boot shell.
Each uthread has its own stack allocated on the heap. The default stack
size is defined by the UTHREAD_STACK_SIZE symbol and is used when
uthread_create() receives zero for the stack_sz argument.

The implementation is based on context-switching via initjmp()/setjmp()/
longjmp() and is inspired from barebox threads [1]. A notion of thread
group helps with dependencies, such as when a thread needs to block
until a number of other threads have returned.

The name "uthread" comes from "user-space threads" because the
scheduling happens with no help from a higher privileged mode, contrary
to more complex models where kernel threads are defined. But the 'u'
may as well stand for 'U-Boot' since the bootloader may actually be
running at any privilege level and the notion of user vs. kernel may
not make much sense in this context.

[1] https://github.com/barebox/barebox/blob/master/common/bthread.c

Signed-off-by: Jerome Forissier 
Reviewed-by: Ilias Apalodimas

acpi: select CONFIG_BLOBLIST

2025-04-11T11:27:32+00:00

Since commit 53d5a221632e ("emulation: Use bloblist to hold tables")
`make qemu-riscv64_smode_defconfig acpi.config && make` fails with

    qfw_acpi.c:146:(.text.evt_write_acpi_tables+0xc):
    undefined reference to `bloblist_add'

Build with bloblist support.

Fixes: 53d5a221632e ("emulation: Use bloblist to hold tables")
Reviewed-by: Ilias Apalodimas 
Reviewed-by: Tom Rini 
Signed-off-by: Heinrich Schuchardt

Kconfig: Fix "warning: style: quotes recommended" warnings

2025-04-01T14:46:18+00:00

We have three warnings about needing to use quotes around some strings
in Kconfig files today. In two of these cases we can just add the
missing strings. In the case of INTEL_PINCTRL_PADCFG_PADTOL the symbol
is never referenced and should be dropped.

Signed-off-by: Tom Rini

lib: correct description of CONFIG_SYS_FDT_PAD

2025-03-10T06:41:26+00:00

CONFIG_SYS_FDT_PAD defines the number of unused bytes added to a
device-tree and not the total size.

Fixes: 40ed7be4af52 ("Convert CONFIG_SYS_FDT_PAD to Kconfig")
Reviewed-by: Ilias Apalodimas 
Signed-off-by: Heinrich Schuchardt

lib: Allow crc16 code to be dropped

2025-02-03T22:00:42+00:00

This code is not necessarily needed in VPL, even if SPL uses it, so
adjust the rules to allow it to be dropped.

Do the same for the hash API.

Signed-off-by: Simon Glass 
Reviewed-by: Tom Rini

tpm: add wrapper and helper APIs for PCR allocate

2025-01-28T06:58:41+00:00

Add PCR allocate wrapper APIs for using in tcg2 protocol.
The wrapper proceeds a PCR allocate command, followed by a
shutdown command.
A system boot is required after two commands since TPM device needs
a HW reset to activate the new algorithms config.
Also, a helper function is included to determine the new bank mask
for PCR allocation by combining the status of current active,
supported and eventlog bank masks.
A new kconfig is created. PCR allocate and system reboot only
happens when the kconfig is selected, otherwise just exit with
errors.

Signed-off-by: Raymond Mao 
Reviewed-by: Ilias Apalodimas 
Signed-off-by: Ilias Apalodimas

Merge patch series "upl: Prerequite patches for updated spec"

2025-01-22T23:08:47+00:00

Simon Glass  says:

The current UPL spec[1] has been tidied up and improved over the last
year, since U-Boot's original UPL support was written.

This series includes some prerequisite patches needed for the real UPL
patches. It is split from [2]

[1] https://github.com/UniversalPayload/spec/tree/3f1450d
[2] https://patchwork.ozlabs.org/project/uboot/list/?series=438574&state=*

Link: https://lore.kernel.org/r/20250111000029.245022-1-sjg@chromium.org

emulation: Use bloblist to hold tables

2025-01-22T23:08:23+00:00

QEMU can have its own internal ACPI and SMBIOS tables. At present U-Boot
copies out the SMBIOS tables but points directly to the ACPI ones.

The ACPI tables are not aligned on a 4KB boundary, which means that UPL
cannot use them directly, since it uses a reserved-memory node for the
tables and that it assumed (by EDK2) to be 4KB-aligned.

On x86, QEMU provides the tables in a mapped memory region and U-Boot
makes use of these directly, thus making it difficult to use any common
code.

Adjust the logic to fit within the existing table-generation code. Use a
bloblist always and ensure that the ACPI tables is placed in an aligned
region. Set a size of 8K for QEMU. This does not actually put all the
tables in one place, for QEMU, since it currently adds a pointer to the
tables in QFW.

On ARM, enable bloblist so that SMBIOS tables can be added to the
bloblist.

Signed-off-by: Simon Glass

Merge patch series "SMBIOS improvements"

2025-01-14T20:29:49+00:00

Raymond Mao  says:

Motivations for changes:
Current SMBIOS library and command-line tool is not fully matching with
the requirements:
1. Missing support for other mandatory types (#7, #9, #16, #17, #19).
2. Only a few platforms support SMBIOS node from the device tree.
3. Values of some fields are hardcoded in the library other than fetching
   from the device hardware.
4. Embedded data with dynamic length is not supported (E.g. Contained
   Object Handles in Type #2 and Contained Elements in Type #3)

Changes:
1. Refactor the SMBIOS library and command-line tool to better align with
   the SMBIOS spec.
2. Create an arch-specific driver for all aarch64-based platforms to fetch
   SMBIOS private data from the device hardware (processor and cache).
3. Create a sysinfo driver to poppulate platform SMBIOS private data.
4. Add generic SMBIOS DTS file for arm64 platforms for those common strings
   and values which cannot be retrieved from the system registers.
   Vendors can create their own SMBIOS node using this as an example.
   For those boards without SMBIOS nodes, this DTS file can be included to
   have a generic SMBIOS information of the system.
5. Add support for Type #7 (Cache Information) and link its handles to
   Type #4.
6. To minimize size-growth for those platforms which have not sufficient
   ROM spaces or the platforms which don't need detailed SMBIOS
   information, new added fields are only being built when kconfig
   GENERATE_SMBIOS_TABLE_VERBOSE is selected.

Once this patch is acceptted, subsequent patch sets will add other missing
types (#9, #16, #17, #19).

Tests:
To test this with QEMU arm64, please follow the guide on dt_qemu.rst to
get a merged DT to run with.
```
qemu-system-aarch64 -machine virt -machine dumpdtb=qemu.dtb
cat  <(dtc -I dtb qemu.dtb) <(dtc -I dtb ./dts/dt.dtb | grep -v /dts-v1/) \
  | dtc - -o merged.dtb
qemu-system-aarch64 -machine virt -nographic -bios u-boot.bin \
  -dtb merged.dtb
```

Link: https://lore.kernel.org/r/20241206225438.13866-1-raymond.mao@linaro.org

smbios: Refactor smbios library

2025-01-14T20:29:29+00:00

Current smbios library does not fully match to the specification.
It hardcodes values instead of exposing values from the device.
It does not reserve the space to support dynamic length for
contained object handles or elements and misses the handling of
a few of fields.

The refactoring of this patch includes:
1. Expose values from device via sysinfo interface.
2. Replace smbios_add_prop with smbios_add_prop_si to allow getting
   string values from sysinfo.
3. Add smbios_get_val_si to get values from sysinfo or device tree.
4. Use sysinfo_get_data to get data area.
5. Reserve the space of contained object handles and elements.
6. Miscellaneous fixes in smbios.

Signed-off-by: Raymond Mao