Re: [U-BOOT-TEST-HOOKS PATCH 1/1] Enable TPMv2 emulation

2021-11-27 Thread Heinrich Schuchardt 




On 11/27/21 02:38, Tom Rini wrote:

On Wed, Nov 24, 2021 at 08:33:42AM +0100, Heinrich Schuchardt wrote:

On 11/24/21 08:23, Ilias Apalodimas wrote:

Hi Heinrich,

On Mon, 15 Nov 2021 at 12:11, Heinrich Schuchardt
 wrote:


Provide a QEMU helper script to launch swtpm and add extra parameters to
conf.qemu_arm64_na and conf.qemu_arm_na to provide an emulated TPMv2.

Signed-off-by: Heinrich Schuchardt 
---
   bin/qemu.swtpm   | 19 +++
   bin/travis-ci/conf.qemu_arm64_na |  3 ++-
   bin/travis-ci/conf.qemu_arm_na   |  3 ++-
   3 files changed, 23 insertions(+), 2 deletions(-)
   create mode 100755 bin/qemu.swtpm

diff --git a/bin/qemu.swtpm b/bin/qemu.swtpm
new file mode 100755
index 000..089feba
--- /dev/null
+++ b/bin/qemu.swtpm
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: BSD-2
+#
+# This script launches swtpm to emulate a TPMv2. The parameter -t makes it
+# unload when the connection to QEMU is terminated. To make use of it add
+#
+# qemu_helper_script="swtpm"
+#
+# to the board script and the following arguments to qemu_extra_args
+#
+# -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock \
+# -tpmdev emulator,id=tpm0,chardev=chrtpm \
+# -device tpm-tis-device,tpmdev=tpm0
+#
+# U-Boot must be built with CONFIG_TPM2_MMIO=y.
+
+mkdir -p /tmp/tpm
+swtpm socket -t --tpmstate dir=/tmp/tpm --tpm2 \
+--ctrl type=unixio,path=/tmp/tpm/swtpm-sock &


Nit pick the & can be '-d'


Daemonizing will ensure that we don't get console output. I will change
this.




diff --git a/bin/travis-ci/conf.qemu_arm64_na b/bin/travis-ci/conf.qemu_arm64_na
index e7c9426..14577d8 100644
--- a/bin/travis-ci/conf.qemu_arm64_na
+++ b/bin/travis-ci/conf.qemu_arm64_na
@@ -22,8 +22,9 @@

   console_impl=qemu
   qemu_machine="virt"
+qemu_helper_script="swtpm"
   qemu_binary="qemu-system-aarch64"
-qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci"
+qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0"
   qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
   reset_impl=none
   flash_impl=none
diff --git a/bin/travis-ci/conf.qemu_arm_na b/bin/travis-ci/conf.qemu_arm_na
index 0f07c80..de0694d 100644
--- a/bin/travis-ci/conf.qemu_arm_na
+++ b/bin/travis-ci/conf.qemu_arm_na
@@ -22,8 +22,9 @@

   console_impl=qemu
   qemu_machine="virt"
+qemu_helper_script="swtpm"
   qemu_binary="qemu-system-arm"
-qemu_extra_args="-nographic -netdev user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} 
-device e1000,netdev=net0 -device virtio-rng-pci"
+qemu_extra_args="-nographic -netdev user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} 
-device e1000,netdev=net0 -device virtio-rng-pci -chardev 
socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device 
tpm-tis-device,tpmdev=tpm0"


Just a note here 'tpm-tis-device' works for arm.  If we evenr need
this on x86 it's 'tpm-tis' 


This file is ARM specific.


Sure, but it's worth noting since if we can also use these features and
tests on qemu-x86_64 we should.  Doesn't need to be to start with tho.
And I will apply this shortly.



The current version of this patch is:

[v2,1/1] Enable TPMv2 emulation
https://patchwork.ozlabs.org/project/uboot/patch/20211124081251.59511-1-heinrich.schucha...@canonical.com/

On x86 we don't have support for the emulated TPM in U-Boot. According 
to the QEMU documentation you would have to parse  ACPI tables to detect 
if a TPM is made available by QEMU. Maybe you could instead define it in 
arch/x86/dts/qemu-x86_i440fx.dts.

Cf. https://qemu-project.gitlab.io/qemu/specs/tpm.html#acpi-interface

Once that work is done we should enable the TPM emulation on x86 in the 
U-Boot test hooks.


This will be the required settings:

qemu_helper_script="swtpm"
qemu_extra_args="-nographic -cpu qemu64 -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 
-chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm -device tpm-tis,tpmdev=tpm0"


Best regards

Heinrich

Re: [U-BOOT-TEST-HOOKS PATCH 1/1] Enable TPMv2 emulation

2021-11-26 Thread Tom Rini 
On Wed, Nov 24, 2021 at 08:33:42AM +0100, Heinrich Schuchardt wrote:
> On 11/24/21 08:23, Ilias Apalodimas wrote:
> > Hi Heinrich,
> > 
> > On Mon, 15 Nov 2021 at 12:11, Heinrich Schuchardt
> >  wrote:
> > > 
> > > Provide a QEMU helper script to launch swtpm and add extra parameters to
> > > conf.qemu_arm64_na and conf.qemu_arm_na to provide an emulated TPMv2.
> > > 
> > > Signed-off-by: Heinrich Schuchardt 
> > > ---
> > >   bin/qemu.swtpm   | 19 +++
> > >   bin/travis-ci/conf.qemu_arm64_na |  3 ++-
> > >   bin/travis-ci/conf.qemu_arm_na   |  3 ++-
> > >   3 files changed, 23 insertions(+), 2 deletions(-)
> > >   create mode 100755 bin/qemu.swtpm
> > > 
> > > diff --git a/bin/qemu.swtpm b/bin/qemu.swtpm
> > > new file mode 100755
> > > index 000..089feba
> > > --- /dev/null
> > > +++ b/bin/qemu.swtpm
> > > @@ -0,0 +1,19 @@
> > > +#!/bin/sh
> > > +# SPDX-License-Identifier: BSD-2
> > > +#
> > > +# This script launches swtpm to emulate a TPMv2. The parameter -t makes 
> > > it
> > > +# unload when the connection to QEMU is terminated. To make use of it add
> > > +#
> > > +# qemu_helper_script="swtpm"
> > > +#
> > > +# to the board script and the following arguments to qemu_extra_args
> > > +#
> > > +# -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock \
> > > +# -tpmdev emulator,id=tpm0,chardev=chrtpm \
> > > +# -device tpm-tis-device,tpmdev=tpm0
> > > +#
> > > +# U-Boot must be built with CONFIG_TPM2_MMIO=y.
> > > +
> > > +mkdir -p /tmp/tpm
> > > +swtpm socket -t --tpmstate dir=/tmp/tpm --tpm2 \
> > > +--ctrl type=unixio,path=/tmp/tpm/swtpm-sock &
> > 
> > Nit pick the & can be '-d'
> 
> Daemonizing will ensure that we don't get console output. I will change
> this.
> 
> > 
> > > diff --git a/bin/travis-ci/conf.qemu_arm64_na 
> > > b/bin/travis-ci/conf.qemu_arm64_na
> > > index e7c9426..14577d8 100644
> > > --- a/bin/travis-ci/conf.qemu_arm64_na
> > > +++ b/bin/travis-ci/conf.qemu_arm64_na
> > > @@ -22,8 +22,9 @@
> > > 
> > >   console_impl=qemu
> > >   qemu_machine="virt"
> > > +qemu_helper_script="swtpm"
> > >   qemu_binary="qemu-system-aarch64"
> > > -qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
> > > user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 
> > > -device virtio-rng-pci"
> > > +qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
> > > user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 
> > > -device virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock 
> > > -tpmdev emulator,id=tpm0,chardev=chrtpm -device 
> > > tpm-tis-device,tpmdev=tpm0"
> > >   qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
> > >   reset_impl=none
> > >   flash_impl=none
> > > diff --git a/bin/travis-ci/conf.qemu_arm_na 
> > > b/bin/travis-ci/conf.qemu_arm_na
> > > index 0f07c80..de0694d 100644
> > > --- a/bin/travis-ci/conf.qemu_arm_na
> > > +++ b/bin/travis-ci/conf.qemu_arm_na
> > > @@ -22,8 +22,9 @@
> > > 
> > >   console_impl=qemu
> > >   qemu_machine="virt"
> > > +qemu_helper_script="swtpm"
> > >   qemu_binary="qemu-system-arm"
> > > -qemu_extra_args="-nographic -netdev 
> > > user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 
> > > -device virtio-rng-pci"
> > > +qemu_extra_args="-nographic -netdev 
> > > user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 
> > > -device virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock 
> > > -tpmdev emulator,id=tpm0,chardev=chrtpm -device 
> > > tpm-tis-device,tpmdev=tpm0"
> > 
> > Just a note here 'tpm-tis-device' works for arm.  If we evenr need
> > this on x86 it's 'tpm-tis' 
> 
> This file is ARM specific.

Sure, but it's worth noting since if we can also use these features and
tests on qemu-x86_64 we should.  Doesn't need to be to start with tho.
And I will apply this shortly.

-- 
Tom


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Re: [U-BOOT-TEST-HOOKS PATCH 1/1] Enable TPMv2 emulation

2021-11-23 Thread Heinrich Schuchardt 

On 11/24/21 08:23, Ilias Apalodimas wrote:

Hi Heinrich,

On Mon, 15 Nov 2021 at 12:11, Heinrich Schuchardt
 wrote:


Provide a QEMU helper script to launch swtpm and add extra parameters to
conf.qemu_arm64_na and conf.qemu_arm_na to provide an emulated TPMv2.

Signed-off-by: Heinrich Schuchardt 
---
  bin/qemu.swtpm   | 19 +++
  bin/travis-ci/conf.qemu_arm64_na |  3 ++-
  bin/travis-ci/conf.qemu_arm_na   |  3 ++-
  3 files changed, 23 insertions(+), 2 deletions(-)
  create mode 100755 bin/qemu.swtpm

diff --git a/bin/qemu.swtpm b/bin/qemu.swtpm
new file mode 100755
index 000..089feba
--- /dev/null
+++ b/bin/qemu.swtpm
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: BSD-2
+#
+# This script launches swtpm to emulate a TPMv2. The parameter -t makes it
+# unload when the connection to QEMU is terminated. To make use of it add
+#
+# qemu_helper_script="swtpm"
+#
+# to the board script and the following arguments to qemu_extra_args
+#
+# -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock \
+# -tpmdev emulator,id=tpm0,chardev=chrtpm \
+# -device tpm-tis-device,tpmdev=tpm0
+#
+# U-Boot must be built with CONFIG_TPM2_MMIO=y.
+
+mkdir -p /tmp/tpm
+swtpm socket -t --tpmstate dir=/tmp/tpm --tpm2 \
+--ctrl type=unixio,path=/tmp/tpm/swtpm-sock &


Nit pick the & can be '-d'


Daemonizing will ensure that we don't get console output. I will change 
this.





diff --git a/bin/travis-ci/conf.qemu_arm64_na b/bin/travis-ci/conf.qemu_arm64_na
index e7c9426..14577d8 100644
--- a/bin/travis-ci/conf.qemu_arm64_na
+++ b/bin/travis-ci/conf.qemu_arm64_na
@@ -22,8 +22,9 @@

  console_impl=qemu
  qemu_machine="virt"
+qemu_helper_script="swtpm"
  qemu_binary="qemu-system-aarch64"
-qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci"
+qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0"
  qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
  reset_impl=none
  flash_impl=none
diff --git a/bin/travis-ci/conf.qemu_arm_na b/bin/travis-ci/conf.qemu_arm_na
index 0f07c80..de0694d 100644
--- a/bin/travis-ci/conf.qemu_arm_na
+++ b/bin/travis-ci/conf.qemu_arm_na
@@ -22,8 +22,9 @@

  console_impl=qemu
  qemu_machine="virt"
+qemu_helper_script="swtpm"
  qemu_binary="qemu-system-arm"
-qemu_extra_args="-nographic -netdev user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} 
-device e1000,netdev=net0 -device virtio-rng-pci"
+qemu_extra_args="-nographic -netdev user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} 
-device e1000,netdev=net0 -device virtio-rng-pci -chardev 
socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device 
tpm-tis-device,tpmdev=tpm0"


Just a note here 'tpm-tis-device' works for arm.  If we evenr need
this on x86 it's 'tpm-tis' 


This file is ARM specific.

Best regards

Heinrich




  qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
  reset_impl=none
  flash_impl=none
--
2.32.0



Other than that
Reviewed-by: Ilias Apalodimas

Re: [U-BOOT-TEST-HOOKS PATCH 1/1] Enable TPMv2 emulation

2021-11-23 Thread Ilias Apalodimas 
Hi Heinrich,

On Mon, 15 Nov 2021 at 12:11, Heinrich Schuchardt
 wrote:
>
> Provide a QEMU helper script to launch swtpm and add extra parameters to
> conf.qemu_arm64_na and conf.qemu_arm_na to provide an emulated TPMv2.
>
> Signed-off-by: Heinrich Schuchardt 
> ---
>  bin/qemu.swtpm   | 19 +++
>  bin/travis-ci/conf.qemu_arm64_na |  3 ++-
>  bin/travis-ci/conf.qemu_arm_na   |  3 ++-
>  3 files changed, 23 insertions(+), 2 deletions(-)
>  create mode 100755 bin/qemu.swtpm
>
> diff --git a/bin/qemu.swtpm b/bin/qemu.swtpm
> new file mode 100755
> index 000..089feba
> --- /dev/null
> +++ b/bin/qemu.swtpm
> @@ -0,0 +1,19 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: BSD-2
> +#
> +# This script launches swtpm to emulate a TPMv2. The parameter -t makes it
> +# unload when the connection to QEMU is terminated. To make use of it add
> +#
> +# qemu_helper_script="swtpm"
> +#
> +# to the board script and the following arguments to qemu_extra_args
> +#
> +# -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock \
> +# -tpmdev emulator,id=tpm0,chardev=chrtpm \
> +# -device tpm-tis-device,tpmdev=tpm0
> +#
> +# U-Boot must be built with CONFIG_TPM2_MMIO=y.
> +
> +mkdir -p /tmp/tpm
> +swtpm socket -t --tpmstate dir=/tmp/tpm --tpm2 \
> +--ctrl type=unixio,path=/tmp/tpm/swtpm-sock &

Nit pick the & can be '-d'

> diff --git a/bin/travis-ci/conf.qemu_arm64_na 
> b/bin/travis-ci/conf.qemu_arm64_na
> index e7c9426..14577d8 100644
> --- a/bin/travis-ci/conf.qemu_arm64_na
> +++ b/bin/travis-ci/conf.qemu_arm64_na
> @@ -22,8 +22,9 @@
>
>  console_impl=qemu
>  qemu_machine="virt"
> +qemu_helper_script="swtpm"
>  qemu_binary="qemu-system-aarch64"
> -qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
> user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
> virtio-rng-pci"
> +qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
> user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
> virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
> emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0"
>  qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
>  reset_impl=none
>  flash_impl=none
> diff --git a/bin/travis-ci/conf.qemu_arm_na b/bin/travis-ci/conf.qemu_arm_na
> index 0f07c80..de0694d 100644
> --- a/bin/travis-ci/conf.qemu_arm_na
> +++ b/bin/travis-ci/conf.qemu_arm_na
> @@ -22,8 +22,9 @@
>
>  console_impl=qemu
>  qemu_machine="virt"
> +qemu_helper_script="swtpm"
>  qemu_binary="qemu-system-arm"
> -qemu_extra_args="-nographic -netdev 
> user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
> virtio-rng-pci"
> +qemu_extra_args="-nographic -netdev 
> user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
> virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
> emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0"

Just a note here 'tpm-tis-device' works for arm.  If we evenr need
this on x86 it's 'tpm-tis' 

>  qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
>  reset_impl=none
>  flash_impl=none
> --
> 2.32.0
>

Other than that
Reviewed-by: Ilias Apalodimas

[U-BOOT-TEST-HOOKS PATCH 1/1] Enable TPMv2 emulation

2021-11-15 Thread Heinrich Schuchardt 
Provide a QEMU helper script to launch swtpm and add extra parameters to
conf.qemu_arm64_na and conf.qemu_arm_na to provide an emulated TPMv2.

Signed-off-by: Heinrich Schuchardt 
---
 bin/qemu.swtpm   | 19 +++
 bin/travis-ci/conf.qemu_arm64_na |  3 ++-
 bin/travis-ci/conf.qemu_arm_na   |  3 ++-
 3 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100755 bin/qemu.swtpm

diff --git a/bin/qemu.swtpm b/bin/qemu.swtpm
new file mode 100755
index 000..089feba
--- /dev/null
+++ b/bin/qemu.swtpm
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: BSD-2
+#
+# This script launches swtpm to emulate a TPMv2. The parameter -t makes it
+# unload when the connection to QEMU is terminated. To make use of it add
+#
+# qemu_helper_script="swtpm"
+#
+# to the board script and the following arguments to qemu_extra_args
+#
+# -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock \
+# -tpmdev emulator,id=tpm0,chardev=chrtpm \
+# -device tpm-tis-device,tpmdev=tpm0
+#
+# U-Boot must be built with CONFIG_TPM2_MMIO=y.
+
+mkdir -p /tmp/tpm
+swtpm socket -t --tpmstate dir=/tmp/tpm --tpm2 \
+--ctrl type=unixio,path=/tmp/tpm/swtpm-sock &
diff --git a/bin/travis-ci/conf.qemu_arm64_na b/bin/travis-ci/conf.qemu_arm64_na
index e7c9426..14577d8 100644
--- a/bin/travis-ci/conf.qemu_arm64_na
+++ b/bin/travis-ci/conf.qemu_arm64_na
@@ -22,8 +22,9 @@
 
 console_impl=qemu
 qemu_machine="virt"
+qemu_helper_script="swtpm"
 qemu_binary="qemu-system-aarch64"
-qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci"
+qemu_extra_args="-cpu cortex-a57 -nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0"
 qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
 reset_impl=none
 flash_impl=none
diff --git a/bin/travis-ci/conf.qemu_arm_na b/bin/travis-ci/conf.qemu_arm_na
index 0f07c80..de0694d 100644
--- a/bin/travis-ci/conf.qemu_arm_na
+++ b/bin/travis-ci/conf.qemu_arm_na
@@ -22,8 +22,9 @@
 
 console_impl=qemu
 qemu_machine="virt"
+qemu_helper_script="swtpm"
 qemu_binary="qemu-system-arm"
-qemu_extra_args="-nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci"
+qemu_extra_args="-nographic -netdev 
user,id=net0,tftp=${UBOOT_TRAVIS_BUILD_DIR} -device e1000,netdev=net0 -device 
virtio-rng-pci -chardev socket,id=chrtpm,path=/tmp/tpm/swtpm-sock -tpmdev 
emulator,id=tpm0,chardev=chrtpm -device tpm-tis-device,tpmdev=tpm0"
 qemu_kernel_args="-bios ${U_BOOT_BUILD_DIR}/u-boot.bin"
 reset_impl=none
 flash_impl=none
-- 
2.32.0