target.cfg: remove "-work-area-virt 0"

The semantics of "-work-area-virt 0" (or phys) changed with
the patch to require specifying physical or virtrual work
area addresses.  Specifying zero was previously a NOP.  Now
it means that address zero is valid.

This patch addresses three related issues:

 - MMU-less processors should never specify work-area-virt;
   remove those specifications.  Such processors include
   ARM7TDMI, Cortex-M3, and ARM966.

 - MMU-equipped processors *can* specify work-area-virt...
   but zero won't be appropriate, except in mischievous
   contexts (which hide null pointer exceptions).

   Remove those specs from those processors too.  If any of
   those mappings is valid, someone will need to submit a
   patch adding it ... along with a comment saying what OS
   provides the mapping, and in which context.  Example,
   say "works with Linux 2.6.30+, in kernel mode".  (Note
   that ARM Linux doesn't map kernel memory to zero ...)

 - Clarify docs on that "-virt" and other work area stuff.

Seems to me work-area-virt is quite problematic; not every
operating system provides such static mappings; if they do,
they're not in every MMU context...

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

8 files changed, 9 insertions, 9 deletions

diff --git a/tcl/board/at91sam9g20-ek.cfg b/tcl/board/at91sam9g20-ek.cfg
index 00ab7faf..6e8a1934 100644
--- a/tcl/board/at91sam9g20-ek.cfg
+++ b/tcl/board/at91sam9g20-ek.cfg
@@ -41,8 +41,8 @@ target create $_TARGETNAME arm926ejs -endian $_ENDIAN -chain-position $_TARGETNA
 # AT91SAM9G20 has two SRAM areas, one starting at 0x00200000 and the other starting at 0x00300000.
 # Both areas are 16 kB long.
 
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x00200000 -work-area-size 0x4000 -work-area-backup 1
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x00300000 -work-area-size 0x4000 -work-area-backup 1
+#$_TARGETNAME configure -work-area-phys 0x00200000 -work-area-size 0x4000 -work-area-backup 1
+$_TARGETNAME configure -work-area-phys 0x00300000 -work-area-size 0x4000 -work-area-backup 1
 
 # If you don't want to execute built-in boot rom code (and there are good reasons at times not to do that) in the
 # AT91SAM9 family, the microcontroller is a lump on a log without initialization.  Because this family has
diff --git a/tcl/board/digi_connectcore_wi-9c.cfg b/tcl/board/digi_connectcore_wi-9c.cfg
index 58f12a68..e6d17bdd 100644
--- a/tcl/board/digi_connectcore_wi-9c.cfg
+++ b/tcl/board/digi_connectcore_wi-9c.cfg
@@ -114,7 +114,7 @@ $_TARGETNAME configure -event reset-init {
 	reg cpsr 0xd3
 }
 
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x00000000 -work-area-size 0x1000 -work-area-backup 1
+$_TARGETNAME configure -work-area-phys 0x00000000 -work-area-size 0x1000 -work-area-backup 1
 
 #####################
 # Flash configuration
diff --git a/tcl/board/hitex_str9-comstick.cfg b/tcl/board/hitex_str9-comstick.cfg
index 25ff784d..e7b79616 100644
--- a/tcl/board/hitex_str9-comstick.cfg
+++ b/tcl/board/hitex_str9-comstick.cfg
@@ -65,7 +65,7 @@ $_TARGETNAME configure -event reset-init {
 	flash protect 0 0 7 off
 }
 
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x50000000 -work-area-size 16384 -work-area-backup 0
+$_TARGETNAME configure -work-area-phys 0x50000000 -work-area-size 16384 -work-area-backup 0
 
 #flash bank <driver> <base> <size> <chip_width> <bus_width>
 flash bank str9x 0x00000000 0x00080000 0 0 0
diff --git a/tcl/board/linksys_nslu2.cfg b/tcl/board/linksys_nslu2.cfg
index 52984107..e605fc19 100644
--- a/tcl/board/linksys_nslu2.cfg
+++ b/tcl/board/linksys_nslu2.cfg
@@ -4,5 +4,5 @@
 source [find target/ixp42x.cfg]
 # The _TARGETNAME is set by the above.
 
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x00020000 -work-area-size 0x10000 -work-area-backup 0
+$_TARGETNAME configure -work-area-phys 0x00020000 -work-area-size 0x10000 -work-area-backup 0
 
diff --git a/tcl/board/mini2440.cfg b/tcl/board/mini2440.cfg
index 90acafa0..d17b1076 100644
--- a/tcl/board/mini2440.cfg
+++ b/tcl/board/mini2440.cfg
@@ -104,7 +104,7 @@ jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0x0f -expected-id $_C
 
 set _TARGETNAME [format "%s.cpu" $_CHIPNAME]
 target create $_TARGETNAME arm920t -endian $_ENDIAN -chain-position $_TARGETNAME -variant arm920t
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x40000000  -work-area-size 0x4000 -work-area-backup 1
+$_TARGETNAME configure -work-area-phys 0x40000000  -work-area-size 0x4000 -work-area-backup 1
 
 #reset configuration
 jtag_nsrst_delay 100
diff --git a/tcl/board/pxa255_sst.cfg b/tcl/board/pxa255_sst.cfg
index d9f6187b..8bc691ba 100644
--- a/tcl/board/pxa255_sst.cfg
+++ b/tcl/board/pxa255_sst.cfg
@@ -10,7 +10,7 @@
 source [find target/pxa255.cfg]
 
 # Target name is set by above
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x4000000 -work-area-size 0x4000 -work-area-backup 0
+$_TARGETNAME configure -work-area-phys 0x4000000 -work-area-size 0x4000 -work-area-backup 0
 
 # flash bank <driver> <base> <size> <chip_width> <bus_width> <target> [options]
 flash bank cfi 0x00000000 0x80000 2 2 $_TARGETNAME jedec_probe
diff --git a/tcl/board/str910-eval.cfg b/tcl/board/str910-eval.cfg
index e98c1c74..fa872a9b 100644
--- a/tcl/board/str910-eval.cfg
+++ b/tcl/board/str910-eval.cfg
@@ -39,7 +39,7 @@ jtag newtap $_CHIPNAME bs    -irlen 5 -ircapture 0x1 -irmask 0x1 -expected-id $_
 
 set _TARGETNAME [format "%s.cpu" $_CHIPNAME]
 target create $_TARGETNAME arm966e -endian $_ENDIAN -chain-position $_TARGETNAME -variant arm966e
-$_TARGETNAME configure -work-area-phys 0x50000000 -work-area-virt 0x50000000 -work-area-size 16384 -work-area-backup 1
+$_TARGETNAME configure -work-area-phys 0x50000000 -work-area-size 16384 -work-area-backup 1
 
 $_TARGETNAME configure -event reset-init {
 	# We can increase speed now that we know the target is halted.
diff --git a/tcl/board/zy1000.cfg b/tcl/board/zy1000.cfg
index 2e13ecbb..54bb7bb7 100644
--- a/tcl/board/zy1000.cfg
+++ b/tcl/board/zy1000.cfg
@@ -63,7 +63,7 @@ $_TARGETNAME configure -event reset-init {
 
 # required for usable performance. Used for lots of
 # other things than flash programming.
-$_TARGETNAME configure -work-area-virt 0 -work-area-phys 0x00020000 -work-area-size 0x20000 -work-area-backup 0
+$_TARGETNAME configure -work-area-phys 0x00020000 -work-area-size 0x20000 -work-area-backup 0
 
 jtag_khz 16000