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authorH. Peter Anvin <hpa@zytor.com>2007-09-21 16:52:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2007-09-21 16:52:35 -0700
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memdump: a debugging utility to dump memory over a serial port
A memory-dumping utility which runs in real mode. Thus, it can be used to get memory dumps from a relatively pristine system.
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+This is a very simple COMBOOT program which can be used to dump memory
+regions over a serial port. To use it, type on the SYSLINUX command
+line:
+
+memdump <port> <prefix> <start>,<len> <start>,<len>...
+
+For example:
+
+memdump 0 funnysystem- 0,0x600 0x9fc00,0x400 0xf0000,0x10000
+
+... dumps three memory ranges (the standard BIOS memory ranges, often
+useful) onto serial port 0. The <port> can either be in the range 0-3
+for the standard BIOS serial port, or the I/O address of the UART.
+
+The data is transferred using the YMODEM protocol; the Unix
+implementation of this protocol is called "rb" and is part of the
+"lrzsz" (or "rzsz") package. If one uses a terminal program like
+Minicom, there is often a way to invoke it from inside the terminal
+program; in Minicom, this is done with the Ctrl-A R control sequence.