alanyih · December 12, 2013 14:27 · Dec 12, 2013
diff --git a/Device Tree port b/Device Tree port
@@ -0,0 +1,94 @@
+Device Tree port
+https://github.com/raspberrypi/linux/wiki/Device-Tree-port
+
+Table of Contents
+
+        Overview
+            Warning
+        Blocking
+        Implemented
+            Branches
+            Current
+            Other
+        TODO
+        Impractical
+        Unsuitable
+
+Overview
+
+    The device tree branch can now be pushed upstream and usb, ethernet mac, audio, vchiq and vc-mem can be added on in a local branch for now so that everything is still working
+    How to Boot using Device Tree
+
+Warning
+
+    The bcm_dma_* exports are gone - the kernel already has a DMA API
+
+Blocking
+
+    Issue #24
+    The supplied usb driver has broken locking and writes beyond the areas it mallocs
+    The usb chip itself isn't very good
+
+Implemented
+
+    irq handler
+    mmio clocksource
+    mmio clockevent (system timer)
+    sp804 (to detect and disable it)
+    uart0 (pl011)
+    watchdog
+    clk/clkdev (not dt)
+    bcm-mbox (aka vcio)
+    fb
+    video logo
+    bcm-bell
+    system_serial/system_rev/mac_address
+    bcm-vc-power
+    pinctrl
+    pinmux
+    gpio
+    ok-led
+    gpio irq
+    spi
+    i2c
+    dma
+    sdhci pio
+    sdhci dma
+
+Branches
+
+    lp0/rpi-split (rebased continuously)
+    lp0/rpi-linear
+
+Current
+
+    lp0/rpi-next (none)
+
+Other
+
+    lp0/rpi-usb (my dwc2_hcd attempt)
+    lp0/rpi-usb2 (APM dwc otg driver)
+
+TODO
+
+    clk/clkdev (when it gains dt support)
+    pinconf (for pull high/low)
+    spi dma
+    i2c dma
+    usb (uses bcm-vc-power, hack in the current dwc_otg code until a proper driver is merged)
+    ethernet mac address (tricky, some way to absolutely identify that the usb device is the board's and not from somewhere else on the bus might help)
+    pcm/i2s
+    pwm
+    gpio clock (the clk subsystem can be used to turn these on/off and configure them)
+    audio (requires vchiq)
+
+Impractical
+
+    vchiq (aka vc04/vcos, uses bcm-mbox, bcm-bell, requires a major rewrite without breaking the ABI)
+    csi (hidden) :(
+
+Unsuitable
+
+    vc-mem (this will need to use sysfs not /proc)
+
+Last edited by 林镇国, a year ago