FreeCalypso > hg > freecalypso-tools
changeset 512:b0f9d38bfd9e
loadtools/scripts/compal.*: switch to 0x03000000 flash mapping
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Tue, 28 May 2019 17:35:55 +0000 |
parents | 0212edcec4d2 |
children | e8a2634aa265 |
files | loadtools/scripts/compal.config loadtools/scripts/compal.init |
diffstat | 2 files changed, 5 insertions(+), 25 deletions(-) [+] |
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line diff
--- 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
--- 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