Re: Grub doesn’t load devicetree

[Peter Robinson]

On Thu, 29 Aug 2024 at 10:31, Tomaž Zaman <tomaz at mono.si> wrote:

> Doesn’t work - at least not correctly:
>
> => fatload mmc 0:1 $fdt_addr_r /boot/dtb/fsl-ls1046a-rdb-sdk.dtb
> 31793 bytes read in 4 ms (7.6 MiB/s)
> => fatload mmc 0:1 $kernel_addr_r /EFI/boot/grubaa64.efi
> 3978688 bytes read in 168 ms (22.6 MiB/s)
> => setenv fman_ucode
> => bootefi $kernel_addr_r $fdt_addr_r
> Failed to load EFI variables
> WARNING failed to get smmu node: FDT_ERR_NOTFOUND
> WARNING failed to get smmu node: FDT_ERR_NOTFOUND
> Booting /\EFI\boot\grubaa64.efi
> Welcome to GRUB!
>
> Because of those FDT_ERR_NOTFOUND kernel reports a bunch of errors and
> doesn’t boot with all the hardware support I need it to.
>
> On the other hand, if I run the same kernel/devicetree/initramfs with
> booti, bypassing the Grub completely, it works fine. The problem is, I need
> Grub2 for his project.
>

What if you boot the kernel directly using bootefi rather than booti?


> *Tomaž Zaman, *CEO
> Mono Technologies Inc.
> +386 30 651 645
>
>
>
> On 29 Aug 2024 at 10:02 +0200, Peter Robinson <pbrobinson at gmail.com>,
> wrote:
>
> On Thu, 29 Aug 2024 at 05:14, Tomaž Zaman <tomaz at mono.si> wrote:
>
>
> I’m working on an arm64 board with an NXP LS1046A CPU and I simply cannot
> get Grub to load a different device tree than the one that’s provided to it
> by the EFI Stub.
>
> => fatload mmc 0:1 $kernel_addr_r /EFI/boot/grubaa64.efi
> => fatload mmc 0:1 $fdt_addr_r /boot/dtb/fsl-ls1046a-rdb-sdk.dtb
> => bootefi $kernel_addr_r $fdt_addr_r
>
> At his point, I get a couple of errors like “smmu node not found”.
>
> However, if I, instead of "fsl-ls1046a-rdb-sdk.dtb” use
> "fsl-ls1046a-rdb.dtb”, then I get to Grub without any errors.
>
> And this is where I encounter the issue. Because I would like to use a
> different DTB for booting Linux than the one that’s provided by the EFI
> configuration table, I set
>
> devicetree /boot/dtb/fsl-ls1046a-rdb-sdk.dtb
> linux /boot/vmlinuz-6.6.3-arm64
> initrd /boot/initrd.img-6.6.3-arm64
>
> In this case, the devicetree instruction gets ignored completely, and
> before I see kernel loading, the message “Using FDT from the EFI
> configuration table"
>
> Is there a way for me to override/replace the device tree that u-boot
> passed to Grub? I tried passing the “dtb=“ parameter to the kernel boot
> command, but in that case, I get "EFI stub: ERROR: Failed to handle
> fs_proto” because kernel when booting doesn’t appear to have access to the
> same filesystem that Grub does.
>
>
> Why don't you load a new one into memory with u-boot and then grub
> will already have the one you want to use and grun doesn't need to do
> anything. Something like this on the U-Boot command line would load
> the DT and grub and start to boot:
>
> load mmc 0:1 ${kernel_addr_r} EFI/BOOT/BOOTAA64.EFI
> load mmc 0:1 ${fdt_addr_r} dtb/${fdtfile}
> bootefi ${kernel_addr_r} ${fdt_addr_r}
>
> You'll need to adjust for storage, partitions, file paths etc.
>
> Thank you!
>
>
> (this is my first time using *any* mailing list, so apologies if this is
> the wrong address to send this question to)
>
> Tomaž Zaman, CEO
> Mono Technologies Inc.
> +386 30 651 645
>
> [cid:18EB2FEE485A4DD7A1CE716CE14FCBC7]
>
>
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