On 10/3/24 14:30, Sam Edwards wrote:
The CFE bootloader places a stub program at 0x0000-0xFFFF to hold the secondary CPUs until the boot CPU writes the release address. If Linux overwrites this program before execution reaches smp_prepare_cpus(), the secondary CPUs may become inaccessible. This is only a problem with CFE, and then only until the secondary CPUs are brought online. However, since it is such a small amount of memory, it is easiest to reserve it unconditionally. Therefore, add a /reserved-memory node to bcm4908.dtsi to protect this critical memory region. Signed-off-by: Sam Edwards <CFSworks@xxxxxxxxx>
Not objecting to the solution, but should not this be moved to a per-board DTS given that there are boards using CFE, and some using u-boot + ARM TF that are unlikely to suffer from that problem?
-- Florian
