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looks like the start board is a gd32vf103cbt from the tiny print silk-screened on the chip.
which means it has 128k flash and 32k sram and 37(!) gpio pins
| area | start | end |
|-------------+-------------+-------------|
| sram region | ~0x2000_0000~ | ~0x2001_7fff~ |
| boot loader | ~0x1fff_b000~ | ~0x1fff_f7ff~ |
| main flash | ~0x0800_0000~ | ~0x0801_ffff~ |
interrupt vector table is 4096 words starting from the start of flash (~mtvt~ register). ~_start~ should be at the end of the vector.
according to the user manual (pg 51), at least when waking up, the system boots from ~0x0000_0000~ (which is an alias to the start of the main flash, iirc)
usb is 2.0 full-speed (12Mbps)
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