On 1/17/23 2:46 PM, Bajjuri, Praneeth wrote:
+Kamlesh
On 1/17/2023 9:44 AM, Andrew Davis via lists.yoctoproject.org wrote:
On 1/17/23 12:12 AM, Dhruva Gole wrote:
commit 98506a4a07363 ("optee-os: Update SRCREV for OP-TEE TRNG in AM62X")
Disables SW PRNG => Enabling Hardware RNG. This is breaking Suspend Resume
on AM62xx EVM variants. To fix this keep using SOFTWARE_PRNG enabled as
it was.
Cc: [email protected]
Cc: Andrew Davis <[email protected]>
Signed-off-by: Dhruva Gole <[email protected]>
---
Your subject tag is a bit off, I usually use:
--subject-prefix="meta-ti][dunfell][PATCH"
As for the patch, do we have any insight into why RNG use is causing
issues with suspend/resume? I'm not seeing any suspend/resume hooks
in the OPTEE RNG Linux driver, what all have you tried so far to
fix the issue (outside of just disabling support like here, which
should be a last resort).
Andrew, Agreed on the investigation part. Kamlesh will be investigating this
once back from vacation.
For now, this patch going to SW PRNG is unblocking LPM S/R driver validation
and would prefer to go to this , and continue to investigate the HW RNG impact
with S/R scenario.
My only issue is that this unconditionally turns off this feature for
AM62x users, would it work to instead disable the "optee" node in the
lpmdemo.dts file until the driver can be fixed to support LPM?
Andrew
Andrew
I haven't tested thoroughly using bitbake and built from scratch yet,
however locally in my OPTEE Repo the command I run is
...
make -j14 CROSS_COMPILE64=aarch64-none-linux-gnu- PLATFORM=k3-am62x
CFG_ARM64_core=y CFG_TEE_CORE_LOG_LEVEL=1 CFG_TEE_CORE_DEBUG=y
CFG_WITH_SOFTWARE_PRNG=y
...
and this seems to get low power mode (suspend resume) functional for
AM625 SK EVM that I am testing on.
recipes-security/optee/optee-os_%.bbappend | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/recipes-security/optee/optee-os_%.bbappend
b/recipes-security/optee/optee-os_%.bbappend
index db9064deba27..83eb9c6a20c6 100644
--- a/recipes-security/optee/optee-os_%.bbappend
+++ b/recipes-security/optee/optee-os_%.bbappend
@@ -6,8 +6,8 @@ DEPENDS_append_ti-soc = " python3-cryptography-native"
EXTRA_OEMAKE_append_k3 = "${@ 'CFG_CONSOLE_UART='+ d.getVar('OPTEE_K3_USART') if
d.getVar('OPTEE_K3_USART') else ''}"
-EXTRA_OEMAKE_append_am62xx-evm = " CFG_TEE_CORE_LOG_LEVEL=1"
-EXTRA_OEMAKE_append_am62xx-lp-evm = " CFG_TEE_CORE_LOG_LEVEL=1"
+EXTRA_OEMAKE_append_am62xx-evm = " CFG_WITH_SOFTWARE_PRNG=y
CFG_TEE_CORE_LOG_LEVEL=1"
+EXTRA_OEMAKE_append_am62xx-lp-evm = " CFG_WITH_SOFTWARE_PRNG=y
CFG_TEE_CORE_LOG_LEVEL=1"
EXTRA_OEMAKE_append_am62axx-evm = " CFG_TEE_CORE_LOG_LEVEL=1"
do_compile_prepend_ti-soc() {
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