Record networking and DMA development progress

Add the current OS source tree, build scripts, system image layout, and development notes covering DMA page allocation, e1000 bring-up, net API dispatch, and DHCP work in progress.

CODE/dsk/linker.ld

@@ -0,0 +1,27 @@
+ENTRY(dsk_entry)
+
+PHDRS
+{
+    text   PT_LOAD FLAGS(5); /* R-X */
+    rodata PT_LOAD FLAGS(4); /* R-- */
+    data   PT_LOAD FLAGS(6); /* RW- */
+}
+
+SECTIONS
+{
+    . = 0x1000;
+
+    .text : ALIGN(4K) {
+        *(.text*)
+    } :text
+
+    .rodata : ALIGN(4K) {
+        *(.rodata*)
+    } :rodata
+
+    .data : ALIGN(4K) {
+        *(.data*)
+        *(COMMON)
+        *(.bss*)
+    } :data
+}