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Re: dmidecode

On 04.08.21 00:51, Jessica Clarke wrote:
On 3 Aug 2021, at 23:42, Paul Wise <pabs@debian.org> wrote:

On Tue, 03 Aug 2021 20:14:57 +0200 Jörg Frings-Fürst wrote:

because of the bugreport[1] I would like to ask here if it is useful to
compile dmidecode also for riscv64?

Apparently the SMBIOS spec v3.3.0 and later includes RISC-V support:


I've no idea if dmidecode meaningfully works on RISC-V hardware though?

I’m unaware of any systems that provide it. The whole EDK2+ACPI+SMBIOS
ecosystem remains rather far off for RISC-V at this point, especially
given ACPI will only include bindings for the future generation of
interrupt controllers and thus will never be supported for the current
generation of hardware. If it compiles then it might as well be
enabled, but this hardly seems essential, nor worth Ubuntu carrying a
patch for.

Looking at dmidecode itself, the primary reason it shouldn’t be
Architecture: any is it assumes unaligned access and little-endianness
manually, which is atrocious software engineering practice in many
respects... and for added fun it defines its own u64 type as a struct
containing a pair of u32’s (also manually typedef’ed to unsigned int)
whose order depends on BIGENDIAN.


When booting the HiFive Unmatched via U-Boot's UEFI implementation dmidecode will show information about the firmware and the board serial number:

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: U-Boot
        Version: 2021.10-rc1-00106-g98b352ffeb
        Release Date: 10/01/2021
        ROM Size: 64 kB
                PCI is supported
                BIOS is upgradeable
                Selectable boot is supported
                Targeted content distribution is supported
                UEFI is supported
        BIOS Revision: 21.10

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: Unknown
        Product Name: Unknown Product
        Version: Not Specified
        Serial Number: SF105SZ212200xxx
        UUID: 30314653-5335-325a-3132-323030373036
        Wake-up Type: Reserved
        SKU Number: Not Specified
        Family: Not Specified

Further work in U-Boot will be needed to fill the missing fields.

Best regards


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