SeaBIOS Git Change Log

Age Message
6 days 9 hours coreboot: Adapt to upstream CBMEM console changes

coreboot's CBMEM console format changed with This patch adapts the SeaBIOS
implementation to support the new format. (SeaBIOS versions with this
patch will continue to work fine with older version of coreboot. SeaBIOS
versions without this patch may fail to log messages to the CBMEM
console if run with newer versions of coreboot, but should not
experience any more serious issues than that.)

Signed-off-by: Julius Werner <>
Commit 19fdcca467ad3436d68ef88899b4dcd78154a9c6, by Julius Werner
28 days 10 hours config: Add function to check if fw_cfg exists

It was found qemu_get_present_cpus_count may return impossible
number of cpus because of not checking if fw_cfg exists before
using it. That may lead to undefined behavior of emulator,
in particular Bochs that freezes.

Signed-off-by: Petr Berky <>
1 month 22 days resume: Don't attempt to use generic reboot mechanisms on QEMU

On QEMU it's necessary to manually reset the BIOS memory region
between 0xc0000-0x100000 on a reboot. After this manual memory reset
is completed, it's not valid to use the generic reset mechanisms.
Rename qemu_prep_reset() to qemu_reboot() and change the function to
immediately reboot after the code memcpy.

This fixes a bug that could cause code corruption on reboots - calling
the udelay() function (as invoked by i8042_reboot and/or pci_reboot)
was not valid after the BIOS was memcpy'd.

Reported-by: "Dr. David Alan Gilbert" <>
Tested-by: Dr. David Alan Gilbert <>
Signed-off-by: Kevin O'Connor <>
2 months 2 days nvme: fix copy-paste mistake in comment

Signed-off-by: Daniel Verkamp <>
Reviewed-by: Philippe Mathieu-Daudé <>
Commit 1415d46dc87fd8bf1d6acd97c1ad60e893f62523, by Daniel Verkamp
2 months 2 days nvme: fix extraction of status code bits

The status code field is 8 bits wide starting at bit 1; the previous
code would truncate the top bit.

Signed-off-by: Daniel Verkamp <>
Reviewed-by: Philippe Mathieu-Daudé <>
Commit d8a6c846924df07af2e48796af8b0a0f03e94f9a, by Daniel Verkamp
2 months 2 days nvme: fix reversed loop condition in cmd_readwrite

It looks like the intent was to exit the loop if a command failed, but
the current code would actually continue looping in that case.

Signed-off-by: Daniel Verkamp <>
Reviewed-by: Philippe Mathieu-Daudé <>
Commit 2e82b465fbdb46efdc2ebb638aef17fa7f665dc5, by Daniel Verkamp
2 months 2 days nvme: extend command timeout to 5 seconds

500 ms is not sufficient for the admin commands used during
initialization on some real hardware.

Signed-off-by: Daniel Verkamp <>
Commit 21de72ffe8dcddf126c136918951c441edf85929, by Daniel Verkamp
2 months 2 days nvme: support NVMe 1.0 controllers

Rather than using the Identify command with CNS 01b (GET_NS_LIST), which
was added in NVMe 1.1, we can just enumerate all of the possible
namespace IDs.

The relevant part of the NVMe spec reads:

Namespaces shall be allocated in order (starting with 1) and packed

Since the previously-used GET_NS_LIST only returns active namespaces, we
also need a check in nvme_probe_ns() to ensure that inactive namespaces
are not reported as boot devices. This can be accomplished by checking
for non-zero block count - the spec indicates that Identify Namespace
for an inactive namespace ID will return all zeroes.

This should have no impact on the QEMU NVMe device model, since it
always reports exactly one namespace (NSID 1).

Signed-off-by: Daniel Verkamp <>
Commit f21e3044a6b8c2195fb243aeb20b3511569e120a, by Daniel Verkamp
1 month 23 days docs: Note release dates for 1.10.1 and 1.10.2

Signed-off-by: Kevin O'Connor <>
2 months 5 days QEMU fw_cfg: Write fw_cfg back on S3 resume

Any pointers to BIOS-allocated memory that were written back to QEMU
fw_cfg files are replayed when resuming from S3 sleep.

Signed-off-by: Ben Warren <>
Reviewed-by: Laszlo Ersek <>
Reviewed-by: Igor Mammedov <>
Signed-off-by: Kevin O'Connor <>
2 months 5 days QEMU fw_cfg: Add functions for accessing files by key

Due to memory contraints, when resuming from S3 the fw_cfg "files" API
isn't available. This adds a simple API to get a file 'key', and to
write to the file using the key as a reference.

Signed-off-by: Ben Warren <>
Reviewed-by: Igor Mammedov <>
Reviewed-by: Laszlo Ersek <>
2 months 5 days QEMU fw_cfg: Add command to write back address of file

This command is similar to ADD_POINTER, but instead of patching
memory, it writes the pointer back to QEMU over the DMA interface.

Signed-off-by: Ben Warren <>
Reviewed-by: Laszlo Ersek <>
Reviewed-by: Igor Mammedov <>
2 months 5 days romfile-loader: Switch to using named structs

This is a little cleaner and matches how the command structures are
defined in QEMU.

Signed-off-by: Ben Warren <>
Reviewed-by: Laszlo Ersek <>
Reviewed-by: Igor Mammedov <>
2 months 5 days QEMU DMA: Add DMA write capability

This allows BIOS to write data back to QEMU using the DMA interface and
provides a higher-level abstraction to write to a fw_cfg file

Signed-off-by: Ben Warren <>
Reviewed-by: Laszlo Ersek <>
Reviewed-by: Igor Mammedov <>
2 months 12 days block: add NVMe boot support

This patch enables SeaBIOS to boot from NVMe. Finding namespaces and
basic I/O works. Testing has been done in qemu and so far it works with
Grub, syslinux, and the FreeBSD loader. You need a recent Qemu (>=
2.7.0), because older versions have buggy NVMe support.

The NVMe code is currently only enabled on Qemu due to lack of testing
on real hardware.

Signed-off-by: Julian Stecklina <>
Commit c83e15b60b7c59552a44d71d0582f2d62a6084a7, by Julian Stecklina
2 months 14 days ps2port: Disable keyboard/mouse prior to resetting ps2 controller

If one of the ps2 ports is enabled prior to the ps2 controller reset
then it is possible a device event (eg, key press or mouse move) could
be mistaken for the controller reset response code. This would result
in a failure and the keyboard would be disabled during the boot.
Always disabling the keyboard and mouse prior to reset ensures that
the controller reset return code can be read properly.

Tested-by: Paul Menzel <>
Signed-off-by: Kevin O'Connor <>
3 months 5 days vgasrc: Increase debug level

You only want this information for debugging. As it also slows down the
boot considerably, as, for example, for every character of the GRUB
menu, something is sent over the serial console.

Therefore, increase the debugging level to 9.

Signed-off-by: Paul Menzel <>
3 months 12 days ahci: Set upper 32-bit registers to zero

If the HBA supports 64-bit addressing, the registers may contain
non-zero values, for example after reboot as a leftover from the
OS driving the adapter.

Reviewed-by: Paolo Bonzini <>
Signed-off-by: Ladi Prosek <>
4 months 5 days serialio: Support for mmap serial ports

Some chipsets have memory mapped serial ports. The protocol is the same
as an standard uart, but with memory read/write instead of inb/outb.

Tested-by: Ricardo Ribalda Delgado <>
Signed-off-by: Ricardo Ribalda Delgado <>
Signed-off-by: Kevin O'Connor <>
Commit 9332965e1c46ddf4e19d7050f1e957a195c703fa, by Ricardo Ribalda Delgado
5 months 2 days tpm: Log TPM 2 digest structure in little endian format

The parameters for extending the PCRs of a TPM 2 are written in
big endian format when sent to the TPM. However, the log needs
to be written in little endian format, so we cannot just copy
the structure into the log as-is. To support the little endian
format in the log, we extend the function writing the TPM 2
digest structure with a parameter that allows us to choose the
endianess of a few parameters. We then rewrite the digest structure
in little endian format for the log.

Signed-off-by: Stefan Berger <>
Commit 7b7b49e2898613dd6cf82473fa9b702541f218d6, by Stefan Berger
8 months 15 days tpm: Rework tpm_build_and_send_cmd() into tpm_simple_cmd()

Instead of passing an arbitrary buffer as a parameter to
tpm_build_and_send_cmd(), just support the simpler case of a parameter
that is only 0, 1, or 2 bytes in length. This allows the callers to
pass the parameter directly and not worry about the big-endian
encoding. Rename the function to tpm_simple_cmd().

Signed-off-by: Kevin O'Connor <>
8 months 15 days tpm: Don't call tpm_build_and_send_cmd() from tpm20_stirrandom()

Instead call tpmhw_transmit() directly.

Signed-off-by: Kevin O'Connor <>
1 year 3 months acpi: Generalize find_fadt() and find_tcpa_by_rsdp() into find_acpi_table()

The find_fadt() and find_tcpa_by_rsdp() functions are very similar.
Create a new find_acpi_table() function and replace the two functions
with this new function.

Signed-off-by: Kevin O'Connor <>
8 months 15 days tpm: Move code around in tcgbios.c to keep like code together

No code changes; just code movement.

Signed-off-by: Kevin O'Connor <>
8 months 15 days tpm: Don't call tpm_set_failure() from tpm12_get_capability()

In the event of a failure in the low-level tpm12_get_capability()
code, just return an error code. The caller can shutdown the TPM if
needed - the only place where that is needed is during a failure in

Signed-off-by: Kevin O'Connor <>