Remove old code

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>

1 files changed, 0 insertions, 23 deletions

diff --git a/docs/dev/dev_device.md b/docs/dev/dev_device.md
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index 1eb6462..0000000
--- a/docs/dev/dev_device.md
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-# Dev log
-## **3.Device Model & HAL:**
-* Interrupt Controller: PLIC:
-
-    * Implement the PLIC (Platform-Level Interrupt Controller) driver.
-
-    * Set the PLIC priority threshold and enable bits during the start() phase.
-
-    * Dispatch Cause 9 (External Interrupt) in kerneltrap/usertrap.
-
-* Character Device: Interrupt-Driven Console:
-
-    * Implement a Ring Buffer. uart_putc returns immediately after writing to the buffer.
-
-    * UART transmit interrupt: triggers when the serial port is idle, the ISR takes data from the Ring Buffer and writes it to the register.
-
-    * UART receive interrupt: triggers when a key is pressed, the ISR reads the character and wakes up the process waiting to read.
-
-* Block Device: VirtIO-Blk:
-
-    * Implement a block device driver for the PCI or MMIO transport layer according to the VirtIO 2.0 standard.
-
-    * DMA: Use the Buddy System to allocate contiguous memory as the descriptor table for the Virtqueue.
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