[PATCH] arm: Backward compatibility to U-Boot v2020.04

[Dorde Stojicevic]

Hi,

yes of course.

Here it is:

$ mkimage -l build/ed7ct-cb.srp
FIT description: LynxSecure 2025.10.0-39844b80e0 SRP (aarch64)
Created:         Thu Feb  5 13:58:31 2026
 Image 0 (kernel-1)
  Description:  LynxSecure 2025.10.0-39844b80e0 SRP (aarch64)
  Created:      Thu Feb  5 13:58:31 2026
  Type:         Kernel Image
  Compression:  uncompressed
  Data Size:    262512264 Bytes = 256359.63 KiB = 250.35 MiB
  Architecture: AArch64
  OS:           Linux
  Load Address: 0x40200000
  Entry Point:  0x40200040
 Image 1 (fdt-1)
  Description:  Flattened Device Tree blob for LynxSecure 2025.10.0-39844b80e0 SRP (aarch64)
  Created:      Thu Feb  5 13:58:31 2026
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    79519 Bytes = 77.66 KiB = 0.08 MiB
  Architecture: AArch64
 Default Configuration: 'conf-1'
 Configuration 0 (conf-1)
  Description:  LynxSecure 2025.10.0-39844b80e0 SRP (aarch64)
  Kernel:       kernel-1
  FDT:          fdt-1

Pls keep me in to loop, I am quite interested in this

Greetings
Dorde


Dorde Stojicevic

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-----Original Message-----
From: Tom Rini <trini at konsulko.com> 
Sent: Friday, February 6, 2026 2:55 AM
To: Stojicevic Dorde (11SIEPT1) <dorde.stojicevic at rohde-schwarz.com>
Cc: Quentin Schulz <quentin.schulz at cherry.de>; u-boot at lists.denx.de
Subject: *EXT* Re: Re: [PATCH] arm: Backward compatibility to U-Boot v2020.04 ***CAUTION_Invalid_Signature***

On Thu, Feb 05, 2026 at 12:20:27PM +0000, Dorde Stojicevic wrote:
> Hi guys,
> 
> and thanks for your fast response.
> 
> Sorry for the formatting issue, I am bound to our company Outlook, which hard-codes our signatures, so this one will not be possible to take out. I am not quite sure git send-email would work, for the same reason + corporate stuff....
> 
> Anyhow, an update/clarification on the things going on here (I could/should have sent initially, sorry for that):
> 
> 1) Lynx Toolchain compiles a FIT Image with the following structure:
> 	{
> 		Images{
> 			Kernel-1 {
> 				Data=Image;
> 			}
> 			Fdt-1 {
> 				Data=system.dtb;
> 			}
> 		}
> 		Configurations {
> 			Here kernel-1 and fdt-1 used as default conf-1
> 		}
> 	}
> 2) Data=Image does not have the Magic Code 0x644d5241
> 3) It is booting with U-Boot SPL 2020.04+g1ccc9d93576+p1 according to Lynx. I haven´t tested myself since we started with 2024.04, and we need it for some other features.
> 4) Then I investigated differences v2020.04 vs v2024.04, and found this part of code came in.
> 5) The finding is consistent with last error reported by U-Boot prior to reset "Bad Linux ARM64 Image magic!"
> 
> 6) I 1st tried patching the Data=Image in Lynx FIT with the magic code, but it didn’t work.
> 7) once I patched bootm in U-Boot to skip this part and behaves as in 
> v2020.04 (excluded all restructuring etc.) it booted the Lynx kernel
> 
> Basically, v2024.04 correctly detects "Bad Linux ARM64 Image magic!", as none is there at the moment, but in order to boot Lynx Hypervisor as-is this backward compatibility to v2020.04 is needed.
> 
> Does this shine more light on it?

This is helpful, yes, thanks. Can you provide an "mkimage -l" of one of these failing to boot FIT images?

--
Tom
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