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[Qemu-devel] [PATCH v5 3/3] docs: Add a generic loader explanation docum

From: Alistair Francis
Subject: [Qemu-devel] [PATCH v5 3/3] docs: Add a generic loader explanation document
Date: Thu, 12 May 2016 09:13:12 -0700

Signed-off-by: Alistair Francis <address@hidden>
 - Re-write to be more comprehensive

 docs/generic-loader.txt | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 docs/generic-loader.txt

diff --git a/docs/generic-loader.txt b/docs/generic-loader.txt
new file mode 100644
index 0000000..b748f2a
--- /dev/null
+++ b/docs/generic-loader.txt
@@ -0,0 +1,56 @@
+Copyright (c) 2016 Xilinx Inc.
+This work is licensed under the terms of the GNU GPL, version 2 or later.  See
+the COPYING file in the top-level directory.
+The 'loader' device allows the user to load multiple images or values into
+QEMU at startup.
+Loading Memory Values
+The loader device allows memory values to be set from the command line. This
+can be done by following the syntax below:
+    -device loader,addr=<addr>,data=<data>,data-len=<len>
+    -device loader,addr=<addr>,cpu-num=<cpu-num>
+NOTE: The loader device supports other options (see the next section) but they
+      do not apply to setting memory values and will be ignored.
+      It is also possible to mix the commands above, e.g. include the cpu-num
+      argument with the data argument.
+    <addr>      - The address to store the data or the value to set the CPUs PC
+    <data>      - The value to be written to the addr. The maximum size of the
+                  data is 8 bytes.
+    <data-len>  - The length of the data in bytes. This argument must be 
+                  if the data argument is.
+    <data-be>   - Set to true if the data to be stored on the guest should be
+                  written as big endian data. The default is to write little
+                  endian data.
+    <cpu-num>   - This will cause the CPU to be reset and the PC to be set to
+                  the value of addr.
+An example of loading value 0x8000000e to address 0xfd1a0104 is:
+    -device loader,addr=0xfd1a0104,data=0x8000000e,data-len=4
+Loading Files
+The loader device also allows files to be loaded into memory. This can be done
+similarly to setting memory values. The syntax is shown below:
+    -device loader,file=<file>,addr=<addr>,cpu-num=<cpu-num>,force-raw=<raw>
+    <file>      - A file to be loaded into memory
+    <addr>      - The addr in memory that the file should be loaded. This is
+                  ignored if you are using an ELF (unless force-raw is true).
+                  This is requried if you aren't loading an ELF.
+    <cpu-num>   - This specifices the CPU that should be used. This is an
+                  optional argument and will cause the CPU's PC to be set to
+                  where the image is stored. This option should only be used
+                  for the boot image.
+    <force-raw> - Forces the file to be treated as a raw image. This can be
+                  used to specificy the load address of ELF files.
+An example of loading an ELF file which CPU0 will boot is shown below:
+    -device loader,file=./images/boot.elf,cpu-num=0

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