AXI version `v0.39.4` breaks Linux boot

[alex96295]

It seems that the axi_id_serialize updated in v0.39.4 axi release prevents Linux from booting properly on cheshire - FPGA port; my educated guess comes from these three CIs:

• bumping AXI to v0.39.4 (from v0.39.2, the one currently used in main) in Cheshire leads to a boot failure on both boards: https://iis-git.ee.ethz.ch/github-mirror/cheshire/-/pipelines/93469
• using v0.39.3 leads to a boot success on both genesys2 and vcu128: https://iis-git.ee.ethz.ch/github-mirror/cheshire/-/pipelines/93482
• using v0.39.4, where I use the older version of the id serializer, also leads to success but only on genesys2, while on vcu128 the timing is not closed so implementation fails: https://iis-git.ee.ethz.ch/github-mirror/cheshire/-/pipelines/93489

Proper debugging is required to narrow down the issue, which may contradict the guess above

[alex96295]

@paulsc96 @thommythomaso

[paulsc96]

I forgot to close this one.

TL;DR: Since the serializer changes were yanked since, this is no longer an active bug. Rather, it's most likely an issue with the new serializer design to begin with.