[fedora-arm] Upgrading Uboot is insufficient to migrate my F31 system from WB Dual-C1 to Quad-D1

Hi,

All this talk about Wandboard Quad D1 is because I'm trying to upgrade an
existing device currently running on a Wandboard Dual C1. It's a system
that started as Fedora 25 and was upgraded to Fedora 31 (via dnf
system-upgrade). It's been running fine on the Dual. I upgraded the
U-boot and it still runs fine on the C1, however if I try to use this SD
card in the Quad-D1 I get this during boot:

[ 6.841555] Freeing unused kernel memory: 2048K
[ 6.848283] ------------[ cut here ]------------
[ 6.852985] WARNING: CPU: 2 PID: 1 at arch/arm/mm/dump.c:248
note_page+0x1604
[ 6.860609] arm/mm: Found insecure W+X mapping at address 0xf0879000
[ 6.866994] Modules linked in:
[ 6.870093] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
5.4.17-200.fc31.armv7h1
[ 6.877494] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 6.884062] [<c0311264>] (unwind_backtrace) from [<c030b744>]
(show_stack+0x)
[ 6.891825] [<c030b744>] (show_stack) from [<c0b2d580>]
(dump_stack+0xb4/0xd)
[ 6.899068] [<c0b2d580>] (dump_stack) from [<c034d5bc>] (__warn+0xdc/0xf8)
[ 6.905958] [<c034d5bc>] (__warn) from [<c034d96c>]
(warn_slowpath_fmt+0x70/)
[ 6.913455] [<c034d96c>] (warn_slowpath_fmt) from [<c03197a8>]
(note_page+0x)
[ 6.921383] [<c03197a8>] (note_page) from [<c0319a34>]
(walk_pgd+0xc8/0xe0)
[ 6.928357] [<c0319a34>] (walk_pgd) from [<c0319b10>]
(ptdump_check_wx+0x58/)
[ 6.935858] [<c0319b10>] (ptdump_check_wx) from [<c0b4182c>]
(kernel_init+0x)
[ 6.943706] [<c0b4182c>] (kernel_init) from [<c03010e8>]
(ret_from_fork+0x14)
[ 6.951281] Exception stack(0xee943fb0 to 0xee943ff8)
[ 6.956339] 3fa0: 00000000 00000000
00000
[ 6.964524] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000
00000
[ 6.972708] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 6.979365] ---[ end trace eb98c3200f90d0b6 ]---
[ 6.984352] Checked W+X mappings: FAILED, 1 W+X pages found
[ 6.989965] rodata_test: test data was not read only

and the system doesn't come up completely.

If I used a fresh Fedora-Minimal-31 on the Quad-D1 (or the Dual-C1) it
works fine. Currently the main difference, as far as I can see, is that
there is a different kernel. The working system is running
5.3.7-301.fc31.armv7hl whereas the non-working is running
5.4.17-200.fc31.armv7hl.

I am currently working on upgrading the Fedora-Minimal to a more recent
kernel to try to reproduce the problem; if it doesn't reproduce I will
also try to upgrade the existing system. If it DOES reproduce then
clearly there's something with the F25->F31 filesystem, and I will have to
migrate everything to a fresh install :(

I'll let you know in a couple hours how the testing goes -- unless you've
seen this before and have an easy fix?

-derek

--
Derek Atkins 617-623-3745
derek@ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
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