How to retrieve cpu info from u-boot fucntion?
Hello,
Currently, I am using the MAC address from eth_get_ethaddr() function to calculate a hash value. But, I would like to replace this with a more unique device info such as cpuid or other values. But I could not find any function that can retrieve cpu info.
Can anyone please point me in the correct direction? Do we have any functions for this? Are these things part of the documentation?
Thanks in advance.
Kind regards, Sourabh
Hello,
Is there any update on the below request? Are there any functions similar to eth_get_ethaddr() to retrieve device-specific info? I am working with raspberry pi 0 and there is no network interface card. So, eth_get_ethaddr() returns null
Thanks in advance
On Wed, Jun 19, 2024 at 9:11 AM Sourabh Hegde Ramu hrsourabh1107@gmail.com wrote:
Hello,
Currently, I am using the MAC address from eth_get_ethaddr() function to calculate a hash value. But, I would like to replace this with a more unique device info such as cpuid or other values. But I could not find any function that can retrieve cpu info.
Can anyone please point me in the correct direction? Do we have any functions for this? Are these things part of the documentation?
Thanks in advance.
Kind regards, Sourabh
Hi,
I appear to have missed the first post.
Is there any update on the below request? Are there any functions similar to eth_get_ethaddr() to retrieve device-specific info? I am working with raspberry pi 0 and there is no network interface card. So, eth_get_ethaddr() returns null
So there's a bunch of drivers for OTP/eFuses in drivers/misc/* which provide access to those sort of unique options such as CPU serial numbers, and possibly stored MACs etc.
I know the RPi has a OTP/eFUSE HW IP block, I don't believe U-Boot has a driver for that as yet. The main RPi firmware may have an mbox/API for querying those sorts of things, looking at board/raspberrypi/rpi/rpi.c there's a set_usbethaddr which calls a msg_get_mac_address to request a MAC from the RPi firmware, I suspect that may work for your needs.
Peter
Thanks in advance
On Wed, Jun 19, 2024 at 9:11 AM Sourabh Hegde Ramu hrsourabh1107@gmail.com wrote:
Hello,
Currently, I am using the MAC address from eth_get_ethaddr() function to calculate a hash value. But, I would like to replace this with a more unique device info such as cpuid or other values. But I could not find any function that can retrieve cpu info.
Can anyone please point me in the correct direction? Do we have any functions for this? Are these things part of the documentation?
Thanks in advance.
Kind regards, Sourabh
Hello Peter,
Thanks for the update. Looking at the board/raspberrypi/rpi/rpi.c I think MAC address is only returned for models that have onboard ethernet. but for models raspberry pi 0w / pi 02w it might not return any value. Am I correct? (maybe I overlooked it?) Is there any other approach for this?
Thanks in advance
On Wed, Aug 28, 2024 at 5:31 PM Peter Robinson pbrobinson@gmail.com wrote:
Hi,
I appear to have missed the first post.
Is there any update on the below request? Are there any functions similar to eth_get_ethaddr() to retrieve device-specific info? I am working with raspberry pi 0 and there is no network interface card. So, eth_get_ethaddr() returns null
So there's a bunch of drivers for OTP/eFuses in drivers/misc/* which provide access to those sort of unique options such as CPU serial numbers, and possibly stored MACs etc.
I know the RPi has a OTP/eFUSE HW IP block, I don't believe U-Boot has a driver for that as yet. The main RPi firmware may have an mbox/API for querying those sorts of things, looking at board/raspberrypi/rpi/rpi.c there's a set_usbethaddr which calls a msg_get_mac_address to request a MAC from the RPi firmware, I suspect that may work for your needs.
Peter
Thanks in advance
On Wed, Jun 19, 2024 at 9:11 AM Sourabh Hegde Ramu <
hrsourabh1107@gmail.com>
wrote:
Hello,
Currently, I am using the MAC address from eth_get_ethaddr() function
to
calculate a hash value. But, I would like to replace this with a more unique device info such as cpuid or other values. But I could not find
any
function that can retrieve cpu info.
Can anyone please point me in the correct direction? Do we have any functions for this? Are these things part of the documentation?
Thanks in advance.
Kind regards, Sourabh
Hi Sourabh,
Thanks for the update. Looking at the board/raspberrypi/rpi/rpi.c I think MAC address is only returned for models that have onboard ethernet. but for models raspberry pi 0w / pi 02w it might not return any value. Am I correct? (maybe I overlooked it?) Is there any other approach for this?
TBH I have no idea, in a lot of cases the MACs are written to SoCs long before they end up in a final product so they may well be there.
I have not tried, I was merely pointing out to you possible solutions for you to try. I don't have the original pi0 but I also gave you other possible ways to solve you're problem :)
Thanks in advance
On Wed, Aug 28, 2024 at 5:31 PM Peter Robinson pbrobinson@gmail.com wrote:
Hi,
I appear to have missed the first post.
Is there any update on the below request? Are there any functions similar to eth_get_ethaddr() to retrieve device-specific info? I am working with raspberry pi 0 and there is no network interface card. So, eth_get_ethaddr() returns null
So there's a bunch of drivers for OTP/eFuses in drivers/misc/* which provide access to those sort of unique options such as CPU serial numbers, and possibly stored MACs etc.
I know the RPi has a OTP/eFUSE HW IP block, I don't believe U-Boot has a driver for that as yet. The main RPi firmware may have an mbox/API for querying those sorts of things, looking at board/raspberrypi/rpi/rpi.c there's a set_usbethaddr which calls a msg_get_mac_address to request a MAC from the RPi firmware, I suspect that may work for your needs.
Peter
Thanks in advance
On Wed, Jun 19, 2024 at 9:11 AM Sourabh Hegde Ramu hrsourabh1107@gmail.com wrote:
Hello,
Currently, I am using the MAC address from eth_get_ethaddr() function to calculate a hash value. But, I would like to replace this with a more unique device info such as cpuid or other values. But I could not find any function that can retrieve cpu info.
Can anyone please point me in the correct direction? Do we have any functions for this? Are these things part of the documentation?
Thanks in advance.
Kind regards, Sourabh
Hi,
Thanks for the update.
I was testing the Raspberry Pi 5 with u-boot and noticed I get below error regarding MAC address
bcm2835: Could not query MAC address Net: No ethernet found.
Is this because of a missing implementation of Pi5 network hardware?
Thanks again!
On Thu, Aug 29, 2024 at 10:05 AM Peter Robinson pbrobinson@gmail.com wrote:
Hi Sourabh,
Thanks for the update. Looking at the board/raspberrypi/rpi/rpi.c I
think MAC address is only returned for models that have onboard ethernet. but for models raspberry pi 0w / pi 02w it might not return any value.
Am I correct? (maybe I overlooked it?) Is there any other approach for
this?
TBH I have no idea, in a lot of cases the MACs are written to SoCs long before they end up in a final product so they may well be there.
I have not tried, I was merely pointing out to you possible solutions for you to try. I don't have the original pi0 but I also gave you other possible ways to solve you're problem :)
Thanks in advance
On Wed, Aug 28, 2024 at 5:31 PM Peter Robinson pbrobinson@gmail.com
wrote:
Hi,
I appear to have missed the first post.
Is there any update on the below request? Are there any functions
similar
to eth_get_ethaddr() to retrieve device-specific info? I am working
with
raspberry pi 0 and there is no network interface card. So, eth_get_ethaddr() returns null
So there's a bunch of drivers for OTP/eFuses in drivers/misc/* which provide access to those sort of unique options such as CPU serial numbers, and possibly stored MACs etc.
I know the RPi has a OTP/eFUSE HW IP block, I don't believe U-Boot has a driver for that as yet. The main RPi firmware may have an mbox/API for querying those sorts of things, looking at board/raspberrypi/rpi/rpi.c there's a set_usbethaddr which calls a msg_get_mac_address to request a MAC from the RPi firmware, I suspect that may work for your needs.
Peter
Thanks in advance
On Wed, Jun 19, 2024 at 9:11 AM Sourabh Hegde Ramu <
hrsourabh1107@gmail.com>
wrote:
Hello,
Currently, I am using the MAC address from eth_get_ethaddr()
function to
calculate a hash value. But, I would like to replace this with a
more
unique device info such as cpuid or other values. But I could not
find any
function that can retrieve cpu info.
Can anyone please point me in the correct direction? Do we have any functions for this? Are these things part of the documentation?
Thanks in advance.
Kind regards, Sourabh
participants (2)
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Peter Robinson -
Sourabh Hegde Ramu