docs/rp2: Update general section to give a brief technical overview.

docs/rp2/general.rst

@@ -10,9 +10,27 @@ the RP2040.
 Technical specifications and SoC datasheets
 -------------------------------------------
 
-Datasheets!
+For detailed technical specifications, please refer to the `datasheets
+<https://datasheets.raspberrypi.org/rp2040/rp2040-datasheet.pdf>`_
 
-Short summary of tech specs!
+The RP2040 microcontroller is manufactured on a 40 nm silicon process in a 7x7mm
+QFN-56 SMD package. The key features include:
 
-Description of general structure of the port (it's built on top of the APIs
-provided by the Raspberry Pi SDK).
+* 133 MHz dual ARM Cortex-M0+ cores (overclockable to over 400 MHz)
+* 264KB SRAM in six independent banks
+* No internal Flash or EEPROM memory (after reset, the bootloader loads
+  firmware from either the external flash memory or USB bus into internal SRAM)
+* QSPI bus controller, which
+  supports up to 16 MB of external Flash memory
+* On-chip programmable LDO togenerate core voltage
+* 2 on-chip PLLs to generate USB and core clocks
+* 30 GPIOpins, of which 4 can optionally be used as analog inputs
+
+The peripherals include:
+
+* 2 UARTs
+* 2 SPI controllers
+* 2 I2C contollers
+* 16 PWM channels
+* USB 1.1 controller
+* 8 PIO state machines