[Bug 2069802] Re: [SRU] flash-kernel to support xilinx kria platforms with noble kernel

[Talha Can Havadar]

Hello all,

Just tested flash-kernel (3.107ubuntu13~24.04.1) in -proposed. Rebooted
after installation to be sure that it doesn't break anything and also
checked the updated cma value as well if it is set correctly. Everything
seems to be fine. Thanks for everything!

```
ubuntu at kria:~$ apt policy flash-kernel
flash-kernel:
  Installed: 3.107ubuntu13~24.04.1
  Candidate: 3.107ubuntu13~24.04.1
  Version table:
 *** 3.107ubuntu13~24.04.1 100
        100 http://ports.ubuntu.com/ubuntu-ports noble-proposed/main arm64 Packages
        100 /var/lib/dpkg/status
     3.107ubuntu9~24.04.3 500
        500 http://ports.ubuntu.com/ubuntu-ports noble-updates/main arm64 Packages
     3.107ubuntu8 500
        500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages

ubuntu at kria:~$ sudo dmesg | grep -i cma
[sudo] password for ubuntu: 
[    0.000000] cma: Reserved 800 MiB at 0x0000000044400000 on node -1
[    0.000000] Kernel command line:  root=LABEL=writable rootwait earlycon console=ttyPS1,115200 console=tty1 clk_ignore_unused uio_pdrv_genirq.of_id=generic-uio xilinx_tsn_ep.st_pcp=4 cma=800M 
[    0.000000] Memory: 3124620K/4194304K available (27584K kernel code, 3652K rwdata, 17040K rodata, 8832K init, 1000K bss, 250484K reserved, 819200K cma-reserved)
```

** Tags removed: verification-needed-noble
** Tags added: verification-done-noble

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https://bugs.launchpad.net/bugs/2069802

Title:
  [SRU] flash-kernel to support xilinx kria platforms with noble kernel

Status in flash-kernel package in Ubuntu:
  Fix Released
Status in flash-kernel source package in Noble:
  Fix Committed
Status in flash-kernel source package in Oracular:
  Fix Committed

Bug description:
  [ Impact ]

   * With the current version of flash-kernel, users wont be able to
  boot into xilinx devices using optimised noble kernel because of the
  renaming of device-trees in kernel and cma configuration changes.

   * We need to fix this issue to keep support for xilinx devices in
  noble as well. This must not be back-ported into jammy since the
  kernel in jammy keeps the old names for device-trees and cma
  configuration in there didn't change

   * Patch will fix the issue by updating bootscript and `its` file to
  point correct device-tree files.

  [ Test Plan ]

   * Flash the new image generated with new flash-kernel that has this fix
   * Try booting with new image
   * You should be able to reach the login prompt and be able to login using default username and password
   * This must work for all Kria devices listed below:
    - KV260
    - KR260
    - KD240

  [ Where problems could occur ]
   * This change could only impact Xilinx Kria devices since it will only touch the files used by Xilinx Kria platforms including the ones listed above in test plan
   * Since this is an enablement patch for Ubuntu Noble image on Xilinx Kria platforms, there shouldnt be an impact to devices in the field.
   * If the patch is broken then the devices listed above will still continue to not work.

  [ Other Info ]
   
   * This is based on changes in new optimised kernel: https://code.launchpad.net/~canonical-kernel/ubuntu/+source/linux-xilinx/+git/noble

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