08_scheduler doesn't work about baremetal-arm HOT 3 OPEN

Not bad... I'm impressed!

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It has same issue when testing in ubuntu 20.04 with qemu 4.2.1, but I don't know the reason, however it works after remove "packed" and add "align(4)"

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Good idea to use -d guest_errors. I think unpacking the structs themselves is a bad idea because they are actually aligned in memory per the datasheet. Adding the alignment in the linker works obviously b/c it forces all data to be aligned on a 4-byte boundary, and because the structs are uint32_t they end up aligned. A bad compiler though would still be free to put padding in between the uint32_t, or if they weren't uint32_t padding would get added.

A better solution I think is to use typedef volatile struct __attribute__((packed, aligned(4))) which should align the stuct itself and leave it packed.

I tested this on my system with qemu 8.0.2 and gcc 12.2 and it started working.

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