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Hi,
on the AM64xx EVM, what is the actual Reset Signal being used when doing a Linux "reboot" or a u-boot "reset"?
The EVM has a number of Resets connected such as MCU_RESET and MCU_POR and RESET_REQ.
Is the "reboot" using one of those, and if so, which pin is it driving to get that Reset asserted?
Or is "reboot" using the SW_MCU_WARMRESET?
Thanks!
--Gunter
Hi Gunter,
I'm attaching the two log files I captured using SDK 7.3.1 on AM64x GP EVM:
1. am6_7.3.1_reset.txt: the log file from "reset" cmd @u-boot
2. am6_7.3.1_reboot.txt: the log file from "reboot" cmd @kernel
Based on reading from two registers: 1/. CTRLMMR_MCU_RST_SRC register @0x04518178, 2/. CTRLMMR_RST_SRC register @0x43018178,
=> "SW_MCU_WARMRST" for both cases: "reset" cmd @u-boot and "reboot" cmd @kernel.
You may refer to the section 5.3.5.2.5 SW_MCU_WARMRESETz Reset in AM64x TRM for more details on "SW_MCU_WARMRST".
Best,
-Hong
=> md.l 0x04518174 2 04518174: 00000001 00000000 ........ => md.l 0x43018174 2 43018174: 00000000 00000000 ........ => reset resetting ...� U-Boot SPL 2020.01-ge995ed0ec1 (May 28 2021 - 16:20:13 +0000) SYSFW ABI: 3.1 (firmware rev 0x0015 '21.1.1--v2021.01a (Terrific Lla') SPL initial stack usage: 13396 bytes Trying to boot from MMC2 Starting ATF on ARM64 core... NOTICE: BL31: v2.4(release):2021.00.003-dirty NOTICE: BL31: Built : 14:41:43, May 28 2021 U-Boot SPL 2020.01-ge995ed0ec1 (May 28 2021 - 14:48:57 +0000) SYSFW ABI: 3.1 (firmware rev 0x0015 '21.1.1--v2021.01a (Terrific Lla') Trying to boot from MMC2 U-Boot 2020.01-ge995ed0ec1 (May 28 2021 - 14:48:57 +0000) SoC: AM64X SR1.0 Model: Texas Instruments AM642 EVM Board: AM64-GPEVM rev E2 DRAM: 2 GiB not found for dev mux MMC: sdhci@fa10000: 0, sdhci@fa00000: 1 Loading Environment from FAT... In: serial@2800000 Out: serial@2800000 Err: serial@2800000 Net: Warning: ethernet@8000000 using MAC address from ROM eth0: ethernet@8000000 Hit any key to stop autoboot: 2 0 => md.l 0x04518174 2 04518174: 00000001 00010000 ........ => md.l 0x43018174 2 43018174: 00000000 00010000 ........ =>
root@am64xx-evm:~# uname -a
Linux am64xx-evm 5.4.106-g023faefa70 #1 SMP PREEMPT Fri May 28 14:38:23 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
root@am64xx-evm:~# devmem2 0x04518174
/dev/mem opened.
Memory mapped at address 0xffffb8210000.
Read at address 0x04518174 (0xffffb8218174): 0x00000001
root@am64xx-evm:~# devmem2 0x04518178
/dev/mem opened.
Memory mapped at address 0xffff875f0000.
Read at address 0x04518178 (0xffff875f8178): 0x00000000
root@am64xx-evm:~# devmem2 0x43018174
/dev/mem opened.
Memory mapped at address 0xffffad960000.
Read at address 0x43018174 (0xffffad968174): 0x00000000
root@am64xx-evm:~# devmem2 0x43018178
/dev/mem opened.
Memory mapped at address 0xffff83ad0000.
Read at address 0x43018178 (0xffff83ad8178): 0x00000000
root@am64xx-evm:~# reboot
Stopping Session c1 of user root.
[ OK ] Stopped target Multi-User System.
[ OK ] Stopped target Login Prompts.
[ OK ] Stopped target RPC Port Mapper.
[ OK ] Stopped target Timers.
[ OK ] Stopped Daily rotation of log files.
[ OK ] Stopped Daily Cleanup of Temporary Directories.
[ OK ] Closed Load/Save RF Kill Switch Status /dev/rfkill Watch.
Stopping Job spooling tools...
Stopping Avahi mDNS/DNS-SD Stack...
Stopping benchmark_server.service...
Stopping Periodic Command Scheduler...
Stopping Ethernet Bridge Filtering Tables...
Stopping Getty on tty1...
Stopping irqbalance daemon...
Stopping Reboot and dump vmcore via kexec...
Stopping Lighttpd Daemon...
[ OK ] Stopped Matrix GUI.
Stopping NFS status monitor for NFSv2/3 locking....
Stopping rpmsg_json.service...
Stopping Serial Getty on ttyS1...
Stopping Serial Getty on ttyS2...
Stopping Simple Network Ma�ent Protocol (SNMP) Daemon....
[ OK ] Stopped startwlan.
Stopping strongSwan IPsec �Ev2 daemon using ipsec.conf...
Stopping System Logger Daemon "default" instance...
Stopping Load/Save Random Seed...
Stopping thermal-zone-init.service...
Stopping Vsftpd ftp daemon...
[ OK ] Stopped Job spooling tools.
[ OK ] Stopped Periodic Command Scheduler.
[ OK ] Stopped irqbalance daemon.
[ OK ] Stopped System Logger Daemon "default" instance.
[ OK ] Stopped Avahi mDNS/DNS-SD Stack.
[ OK ] Stopped NFS status monitor for NFSv2/3 locking..
[ OK ] Stopped Vsftpd ftp daemon.
[ OK ] Stopped Getty on tty1.
[ OK ] Stopped Serial Getty on ttyS2.
[ OK ] Stopped Simple Network Man�ement Protocol (SNMP) Daemon..
[ OK ] Stopped benchmark_server.service.
[ OK ] Stopped rpmsg_json.service.
[ OK ] Stopped strongSwan IPsec I�IKEv2 daemon using ipsec.conf.
[ OK ] Stopped Lighttpd Daemon.
[ OK ] Stopped Serial Getty on ttyS1.
[ OK ] Stopped Reboot and dump vmcore via kexec.
[ OK ] Stopped Load/Save Random Seed.
[ OK ] Stopped thermal-zone-init.service.
[ OK ] Stopped Session c1 of user root.
[ OK ] Removed slice system-getty.slice.
[ OK ] Removed slice system-serial\x2dgetty.slice.
[ OK ] Removed slice system-syslog\x2dng.slice.
Stopping LSB: network benchmark...
Stopping syslog.service...
Stopping Login Service...
Stopping User Manager for UID 0...
[ OK ] Stopped Ethernet Bridge Filtering Tables.
[ OK ] Stopped User Manager for UID 0.
[ OK ] Stopped LSB: network benchmark.
[ OK ] Stopped syslog.service.
[ OK ] Stopped target Network is Online.
[ OK ] Stopped target Host and Network Name Lookups.
[ OK ] Stopped target System Time Synchronized.
[ OK ] Stopped target System Time Set.
Stopping telnetd.service...
Stopping User Runtime Directory /run/user/0...
[ OK ] Unmounted /run/user/0.
[ OK ] Stopped Login Service.
[ OK ] Stopped telnetd.service.
[ OK ] Stopped User Runtime Directory /run/user/0.
[ OK ] Removed slice User Slice of UID 0.
Stopping D-Bus System Message Bus...
Stopping Permit User Sessions...
[ OK ] Stopped D-Bus System Message Bus.
[ OK ] Stopped Permit User Sessions.
[ OK ] Stopped target Network.
[ OK ] Stopped target Remote File Systems.
Stopping Network Name Resolution...
[ OK ] Stopped Network Name Resolution.
Stopping Network Service...
[ OK ] Stopped Network Service.
[ OK ] Stopped target Network (Pre).
[ OK ] Stopped IPv6 Packet Filtering Framework.
[ OK ] Stopped IPv4 Packet Filtering Framework.
[ OK ] Stopped target Basic System.
[ OK ] Stopped target Paths.
[ OK ] Stopped Dispatch Password �ts to Console Directory Watch.
[ OK ] Stopped Forward Password R�uests to Wall Directory Watch.
[ OK ] Stopped target Slices.
[ OK ] Removed slice User and Session Slice.
[ OK ] Stopped target Sockets.
[ OK ] Closed Avahi mDNS/DNS-SD Stack Activation Socket.
[ OK ] Closed D-Bus System Message Bus Socket.
[ OK ] Closed dropbear.socket.
[ OK ] Stopped target System Initialization.
Stopping Hardware RNG Entropy Gatherer Daemon...
[ OK ] Stopped Apply Kernel Variables.
[ OK ] Stopped Load Kernel Modules.
Stopping Network Time Synchronization...
[ OK ] Stopped Hardware RNG Entropy Gatherer Daemon.
[ OK ] Stopped Network Time Synchronization.
[ OK ] Stopped Create Volatile Files and Directories.
[ OK ] Stopped target Local File Systems.
Unmounting /media/ram...
Unmounting /run/media/mmcblk1p1...
Unmounting Temporary Directory (/tmp)...
Unmounting /var/volatile...
[ OK ] Unmounted /media/ram.
[ OK ] Unmounted Temporary Directory (/tmp).
[ OK ] Unmounted /var/volatile.
[ OK ] Stopped target Swap.
[ OK ] Unmounted /run/media/mmcblk1p1.
[ OK ] Reached target Unmount All Filesystems.
[ OK ] Stopped File System Check on /dev/mmcblk1p1.
[ OK ] Removed slice system-systemd\x2dfsck.slice.
[ OK ] Stopped target Local File Systems (Pre).
[ OK ] Stopped Remount Root and Kernel File Systems.
[ OK ] Stopped Create Static Device Nodes in /dev.
[ OK ] Reached target Shutdown.
[ OK ] Reached target Final Step.
[ OK ] Started Reboot.
[ OK ] Reached target Reboot.
[ 389.716241] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 392.254362] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[ 392.269876] systemd-journald[154]: Received SIGTERM from PID 1 (systemd-shutdow).
[ 392.279371] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[ 392.295795] systemd-shutdown[1]: Unmounting file systems.
[ 392.304542] [1172]: Remounting '/' read-only in with options '(null)'.
[ 392.347186] EXT4-fs (mmcblk1p2): re-mounted. Opts: (null)
[ 392.358768] systemd-shutdown[1]: All filesystems unmounted.
[ 392.364405] systemd-shutdown[1]: Deactivating swaps.
[ 392.369603] systemd-shutdown[1]: All swaps deactivated.
[ 392.374838] systemd-shutdown[1]: Detaching loop devices.
[ 392.384685] systemd-shutdown[1]: All loop devices detached.
[ 392.390358] systemd-shutdown[1]: Detaching DM devices.
[ 392.395973] systemd-shutdown[1]: All DM devices detached.
[ 392.401398] systemd-shutdown[1]: All filesystems, swaps, loop devices and DM devices detached.
[ 392.417579] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 392.424554] systemd-shutdown[1]: Rebooting.
[ 392.449792] pci_generic_config_write32: 20 callbacks suppressed
[ 392.449811] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0xdc may corrupt adjacent RW1C bits
[ 392.465592] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0xc8 may corrupt adjacent RW1C bits
[ 392.475559] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x92 may corrupt adjacent RW1C bits
[ 392.485283] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x9c may corrupt adjacent RW1C bits
[ 392.495110] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x92 may corrupt adjacent RW1C bits
[ 392.504846] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x4 may corrupt adjacent RW1C bits
[ 392.514577] pci_bus 0000:00: 2-byte config write to 0000:00:00.0 offset 0x4 may corrupt adjacent RW1C bits
[ 392.524865] reboot: Restarting system
U-Boot SPL 2020.01-ge995ed0ec1 (May 28 2021 - 16:20:13 +0000)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.1.1--v2021.01a (Terrific Lla')
SPL initial stack usage: 13396 bytes
Trying to boot from MMC2
Starting ATF on ARM64 core...
NOTICE: BL31: v2.4(release):2021.00.003-dirty
NOTICE: BL31: Built : 14:41:43, May 28 2021
U-Boot SPL 2020.01-ge995ed0ec1 (May 28 2021 - 14:48:57 +0000)
SYSFW ABI: 3.1 (firmware rev 0x0015 '21.1.1--v2021.01a (Terrific Lla')
Trying to boot from MMC2
U-Boot 2020.01-ge995ed0ec1 (May 28 2021 - 14:48:57 +0000)
SoC: AM64X SR1.0
Model: Texas Instruments AM642 EVM
Board: AM64-GPEVM rev E2
DRAM: 2 GiB
not found for dev mux
MMC: sdhci@fa10000: 0, sdhci@fa00000: 1
Loading Environment from FAT... In: serial@2800000
Out: serial@2800000
Err: serial@2800000
Net:
Warning: ethernet@8000000 using MAC address from ROM
eth0: ethernet@8000000
Hit any key to stop autoboot: 2 0
=> md.l 0x04518174 2
04518174: 00000001 00010000 ........
=> md.l 0x43018174 2
43018174: 00000000 00010000 ........
=>