risc-v linux without mmu, uclinux

uclinux 올라간 예제를 찾아보는 중

git clone https://github.com/vowstar/k210-linux-nommu.git cd k210-linux-nommu export PROJ_ROOT=$(pwd) sh ./prepare_buildroot.sh

[링크 : https://www.cnx-software.com/2020/02/17/how-to-build-run-linux-on-kendryte-k210-risc-v-nommu-processor/]

[링크 : https://github.com/vowstar/k210-linux-nommu.git]

 

아키텍쳐를 어떤걸 쓰는지 부터 봐야 하려나?

PREFIX=/opt/riscv-nommu TARGET=riscv32-unknown-linux-gnu ARCH=rv32ima ABI=ilp32

[링크 : https://github.com/chmmn/riscv-uclinux]

 

 

보드에 128Mbit Flash만 달려서 램은 얼마인지 몰랐는데, 온칩 메모리로 SRAM 8MB 라고 한다.

SoC – Kendryte K210 dual core 64-bit RISC-V processor @ 400 MHz (overclockable up to 800 MHz) with KPU CNN hardware accelerator APU audio hardware accelerator with support for up to 8 mics, up to 192 KHz sample rate FPIOA (Field Programmable IO Array) mapping 255 functions to all 48 GPIOs on the chip. 8 MB general purpose SRAM including 5.9MB usable as AI SRAM memory AXI ROM to load user program from SPI flash Storage – micro SD card slot, 8MB SPI flash Display I/F – MCU LCD FPC connector for optional 2.4″ display Camera I/F – DVP camera FPC connector USB – 1x USB type-C port for power and programming Expansion – Breadboard friendly headers with UART, IIC, SPI, I2S, PWM, etc… Misc – 2x buttons, RGB LED Power Supply – Via USB type-C port Performance + Power Consumption – 0.25TOPS @ 0.3W ,400MHz. 0.5 TOPS @ 800 MHz Dimensions – 5.08 x 2.54 mm

[링크 : https://www.cnx-software.com/2018/11/15/maix-development-boards-sipeed-m1-risc-v-ai-module/]

 

K210 芯片基本参数

内核	RISC-V Dual Core 64bit, with FPU
主频	400MHz （可超频至600MHz）
SRAM	内置8M Byte

[링크 : https://wiki.sipeed.com/hardware/en/maix/maixpy_develop_kit_board/maix_bit.html]

 

아무튼 MMU가 없더라도 8MB/32MB 에 400MHz 니까, 적절하게 가지고 놀 수 있는 무언가가 가능할지도?