# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1559064955 0
# Node ID b0f9d38bfd9e086fcc6ce27998c108a69349a996
# Parent  0212edcec4d2be7235e413c8600f22b1efd64a75
loadtools/scripts/compal.*: switch to 0x03000000 flash mapping

diff -r 0212edcec4d2 -r b0f9d38bfd9e loadtools/scripts/compal.config
--- a/loadtools/scripts/compal.config	Tue May 28 17:09:24 2019 +0000
+++ b/loadtools/scripts/compal.config	Tue May 28 17:35:55 2019 +0000
@@ -27,8 +27,8 @@
 init-script compal.init
 
 # Flash can be 2 MiB or 4 MiB, will be autodetected, 4 MiB mapping used
-# mapped at 0, see compal.init for the explanation
-flash single-4M 0
+# mapped at 0x03000000 like on other targets, see updated compal.init script
+flash single-4M 0x03000000
 
 boot-reflash-hack 0x820000 0x10000
 
diff -r 0212edcec4d2 -r b0f9d38bfd9e loadtools/scripts/compal.init
--- a/loadtools/scripts/compal.init	Tue May 28 17:09:24 2019 +0000
+++ b/loadtools/scripts/compal.init	Tue May 28 17:35:55 2019 +0000
@@ -5,27 +5,7 @@
 w16 fffffb00 00A3
 w16 fffffb02 00A3
 
-# On most targets we use the alternate nCS0 mapping at 0x03000000 to access
-# the full flash bank even though the boot ROM is mapped at 0, overlapping
-# the first 8 KiB of flash.  However, the Calypso chip (all versions we work
-# with) has a little design bug in this part of the silicon: the alternate
-# nCS0 mapping at 0x03000000 works only when the debug visibility bit in the
-# API-RHEA control register (bit 6 in the FFFF:FB0E register) is set, and
-# does not work otherwise.  This bit is initially set as the Calypso comes
-# out of reset, and on most platforms we gain loadtool access via the boot ROM,
-# hence the problem does not occur - but on these Compal targets we gain
-# loadtool access either through Compal's bootloader or via tfc139, and in
-# both cases Compal's fw (either the full fw or the bootloader part) has
-# already set the register in question to the runtime operational value of
-# 0x2A (unchanged from TI's TCS211 reference fw), with the debug visibility
-# bit cleared, hence the 0x03000000 flash mapping no longer works.
-#
-# We could write into the FFFF:FB0E register here, restore the Calypso power-up
-# state and use the 0x03000000 mapping like on other platforms, but the problem
-# of the mapping not working as expected was first encountered in 2014 when we
-# started working on Compal targets, whereas the root cause described above was
-# only discovered in 2019.  For now we are keeping the original workaround from
-# 2014: we set the FFFF:FB10 register to map the flash (not the boot ROM)
-# to address 0, and use that "main" mapping instead of the alternate one.
+# Set the debug visibility bit in the FFFF:FB0E register so we can use
+# the flash mapping at 0x03000000 like on all other platforms.
 
-w16 fffffb10 0300
+w16 fffffb0e 006A