The Blue Pill Board (STM32F103C8) is an ARM Cortex-M3 (with 72MHz clock), it is an STM32F1, today on the STM website is listed the STM32F7, which is a Cortex-M7 (clocked at 400MHz).
Currently support for STM32 is based on Arduino's DUE support,
Would it be possible to extend support for the ARM9, such as the S3C2440 (400MHz clock - Like as Friendly ARM mini2440 circuit board)?
The S3C2440A offers outstanding features with its CPU core, a 16/32-bit ARM920T RISC processor designed by Advanced RISC Machines, Ltd. The ARM920T implements MMU, AMBA BUS, and Harvard cache architecture with separate 16KB instruction and 16KB data caches, each with an 8-word line length. By providing a complete set of common system peripherals, the S3C2440A minimizes overall system costs and eliminates the need to configure additional components. The integrated on-chip functions that are described in this document include: • Around 1.2V internal, 1.8V/2.5V/3.3V memory, 3.3V external I/O microprocessor with 16KB I-Cache/16KB D-Cache/MMU • External memory controller (SDRAM Control and Chip Select logic) • LCD controller (up to 4K color STN and 256K color TFT) with LCD-dedicated DMA • 4-ch DMA controllers with external request pins • 3-ch UARTs (IrDA1.0, 64-Byte Tx FIFO, and 64-Byte Rx FIFO) • 2-ch SPls • IIC bus interface (multi-master support) • IIS Audio CODEC interface • AC’97 CODEC interface • SD Host interface version 1.0 & MMC Protocol version 2.11 compatible • 2-ch USB Host controller / 1-ch USB Device controller (ver 1.1) • 4-ch PWM timers / 1-ch Internal timer / Watch Dog Timer • 8-ch 10-bit ADC and Touch screen interface • RTC with calendar function • Camera interface (Max. 4096 x 4096 pixels input support. 2048 x 2048 pixel input support for scaling) • 130 General Purpose I/O ports / 24-ch external interrupt source • Power control: Normal, Slow, Idle and Sleep mode • On-chip clock generator with PLL