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em357: Corrected EM357 support including errata details 

Original submitted code had only been tested with em358, but testing with
actual em357 revealed errors that this patch corrects.

Change-Id: I70cf31210de8ed84e3755a56e76261ad200322bb
Signed-off-by: Ed Beroset <beroset@ieee.org>
Reviewed-on: http://openocd.zylin.com/2581
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Ed Beroset 2015-03-05 20:43:09 -05:00 committed by Paul Fertser
parent e968fd1895
commit 7a7086e644
2 changed files with 15 additions and 3 deletions
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13
tcl/target/em357.cfg
View File

@ -34,7 +34,7 @@ if { [info exists CPUTAPID] } {
if { [info exists BSTAPID] } {
set _BSTAPID $BSTAPID
} else {
set _BSTAPID 0x069aa62b
set _BSTAPID 0x069a962b
}
if { [info exists CHIPNAME] } {
@ -63,5 +63,14 @@ set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME em357 0x08000000 $_FLASHSIZE 0 0 $_TARGETNAME
if { ![using_hla]} {
cortex_m reset_config sysresetreq
# according to errata, we need to use vectreset rather than sysresetreq to avoid lockup
# There is a bug in the chip, which means that when using external debuggers the chip
# may lock up in certain CPU clock modes. Affected modes are operating the CPU at
# 24MHz derived from the 24MHz crystal, or 12MHz derived from the high frequency RC
# oscillator. If an external debugger tool asserts SYSRESETREQ, the chip will lock up and
# require a pin reset or power cycle.
#
# for details, refer to:
# http://www.silabs.com/Support%20Documents/TechnicalDocs/EM35x-Errata.pdf
cortex_m reset_config vectreset
}

5
tcl/target/em358.cfg
View File

@ -1,4 +1,3 @@
#
# Target configuration for the Silicon Labs EM358 chips
#
@ -9,6 +8,10 @@ if { ![info exists CHIPNAME] } {
set CHIPNAME em358
}
if { ![info exists BSTAPID] } {
set BSTAPID 0x069aa62b
}
# 512K of flash in the em358 chips
set FLASHSIZE 0x80000
source [find target/em357.cfg]