Re: Sense of soc bus? (was: [PATCH] base: soc: Export soc_device_to_device() helper)

Andreas Färber
2019-11-15T11:16:01Z

Am 14.11.19 um 23:09 schrieb Rob Herring:
> On Tue, Nov 12, 2019 at 4:47 AM Andreas Färber <afaerber@suse.de> wrote:
>> On the other hand, one might argue that such information should just be
>> parsed by EBBR-conformant bootloaders and be passed to the kernel via
>> standard UEFI interfaces and DMI tables. But I'm not aware of Barebox
>> having implemented any of that yet, and even for U-Boot (e.g., Realtek
>> based consumer devices...) not everyone has the GPL sources or tools to
>> update their bootloader. So, having the kernel we control gather
>> information relevant to kernel developers does make some sense to me.
>
> UEFI and DMI are orthogonal, right. You can't expect DMI on a UEFI+DT system.

Not sure, that's why I CC'ed the EBBR folks for input. If it's not
mandatory today, the next revision of EBBR could just require it - if
that's the unified way between SBBR and EBBR. Little point in doing it
only for EBBR.

On my UEFI+DT based Raspberry Pi 3 Model B I do see it, note the
non-filled Processor Information delivered by U-Boot:

raspi3:~ # dmidecode
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.0 present.
7 structures occupying 253 bytes.
Table at 0x3CB3E020.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
Vendor: U-Boot
Version: 2019.10
Release Date: 10/26/2019
ROM Size: 64 kB
Characteristics:
PCI is supported
BIOS is upgradeable
Selectable boot is supported
I2O boot is supported
Targeted content distribution is supported

Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: raspberrypi
Product Name: rpi
Version: Not Specified
Serial Number: 00000000********
UUID: 30303030-3030-3030-6437-623461336666
Wake-up Type: Reserved
SKU Number: Not Specified
Family: Not Specified

Handle 0x0002, DMI type 2, 14 bytes
Base Board Information
Manufacturer: raspberrypi
Product Name: rpi
Version: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Features:
Board is a hosting board
Location In Chassis: Not Specified
Chassis Handle: 0x0000
Type: Motherboard

Handle 0x0003, DMI type 3, 21 bytes
Chassis Information
Manufacturer: raspberrypi
Type: Desktop
Lock: Not Present
Version: Not Specified
Serial Number: Not Specified
Asset Tag: Not Specified
Boot-up State: Safe
Power Supply State: Safe
Thermal State: Safe
Security Status: None
OEM Information: 0x00000000
Height: Unspecified
Number Of Power Cords: Unspecified
Contained Elements: 0

Handle 0x0004, DMI type 4, 48 bytes
Processor Information
Socket Designation: Not Specified
Type: Central Processor
Family: Unknown
Manufacturer: Unknown
ID: 00 00 00 00 00 00 00 00
Version: Unknown
Voltage: Unknown
External Clock: Unknown
Max Speed: Unknown
Current Speed: Unknown
Status: Unpopulated
Upgrade: None
L1 Cache Handle: Not Provided
L2 Cache Handle: Not Provided
L3 Cache Handle: Not Provided
Serial Number: Not Specified
Asset Tag: Not Specified
Part Number: Not Specified
Characteristics: None

Handle 0x0005, DMI type 32, 11 bytes
System Boot Information
Status: No errors detected

Handle 0x0006, DMI type 127, 4 bytes
End Of Table

Regards,
Andreas

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