Hi Chris, > -----Ursprüngliche Nachricht----- > Von: Chris Johns [mailto:chr...@rtems.org] > Gesendet: Freitag, 26. Juli 2019 02:26 > An: Nils Hölscher > Cc: Sebastian Huber; Sommer, Jan; users@rtems.org > Betreff: Re: Problems running RTEMS on Raspberry Pi2 > > Hi Nils, > > Many thanks for taking the time to review the code, it is appreciated. > > On 25/7/19 10:17 pm, Nils Hölscher wrote: > > Hi, > > > > I think r7 no longer holds the expected value in line 242 > > > <https://git.rtems.org/rtems/tree/bsps/arm/shared/start/start.S?id=bdec > 62c4d5aa25e5a98b9fafe78936a7beb96a6e#n242> and > > that is why it breaks. > > The RPi2 does not support SMP and this instruction is in in an RTEMS_SMP > block. >
I thought the RPi2 (the first version with ARMv7) would support SMP. There was a GSoC for this at some time. Is this not correct anymore? Cheers, Jan > On an SMP build the process index is checked and left in r7. It looks ok to > me. > > > In the old file r7 was holding the value after this > > > <https://git.rtems.org/rtems/tree/bsps/arm/shared/start/start.S?id=af80b > 0a3406bef73dc6550421947a981c939da27#n155> instruction. > > however this not he case in the newer version. > > r7 is used as destination register in more instructions and not only for > holding > > the stack sizes. > > > https://git.rtems.org/rtems/tree/bsps/arm/shared/start/start.S?id=bdec6 > 2c4d5aa25e5a98b9fafe78936a7beb96a6e#n164 > > > https://git.rtems.org/rtems/tree/bsps/arm/shared/start/start.S?id=bdec6 > 2c4d5aa25e5a98b9fafe78936a7beb96a6e#n172 > > The issue is r3 is a poor choice for holding the stack address. On ARMs low > number registers are arguments or local scratch registers when calling C > code. > The call to `bsp_start_arm_drop_hyp_mode` trashes r3. > > I will post a patch to devel with a tested fix ... > > $ sudo rtems-run --rtems-bsp=raspberrypi2 \ > --user-config=/home/chris/.rtemstesterrc `find . -name hello.exe` > Password: > RTEMS Testing - Run, 5.0.not_released > Command Line: /opt/work/rtems/5/bin/rtems-run --rtems- > bsp=raspberrypi2 > --user-config=/home/chris/.rtemstesterrc > ./arm-rtems5/c/raspberrypi2/testsuites/samples/hello.exe > Host: FreeBSD ruru 12.0-RELEASE-p3 FreeBSD 12.0-RELEASE-p3 GENERIC > amd64 > Python: 3.6.6 (default, Oct 2 2018, 01:22:29) [GCC 4.2.1 Compatible > FreeBSD > Clang 6.0.0 (tags/RELEASE_600/final 326565)] > Host: FreeBSD-12.0-RELEASE-p3-amd64-64bit-ELF (FreeBSD ruru 12.0- > RELEASE-p3 > FreeBSD 12.0-RELEASE-p3 GENERIC amd64 amd64) > > > U-Boot 2016.09-rc2-00067-gb615267-dirty (Sep 07 2016 - 17:12:15 +1000) > > DRAM: 128 MiB > RPI 2 Model B (0xa01041) > MMC: bcm2835_sdhci: 0 > reading uboot.env > In: serial > Out: serial > Err: serial > Net: Net Initialization Skipped > No ethernet found. > Hit any key to stop autoboot: 0 > starting USB... > USB0: Core Release: 2.80a > scanning bus 0 for devices... 3 USB Device(s) found > scanning usb for storage devices... 0 Storage Device(s) found > scanning usb for ethernet devices... 1 Ethernet Device(s) found > Waiting for Ethernet connection... done. > BOOTP broadcast 1 > DHCP client bound to address 10.10.5.147 (8 ms) > Waiting for Ethernet connection... done. > Using sms0 device > TFTP from server 10.10.5.2; our IP address is 10.10.5.147 > Filename '/rpi2/rtems.img'. > Load address: 0x1000000 > Loading: ################################################## > 53.8 KiB > 2.8 MiB/s > done > Bytes transferred = 55081 (d729 hex) > CACHE: Misaligned operation at range [01000000, 0100d729] > ## Booting kernel from Legacy Image at 01000000 ... > Image Name: RTEMS > Image Type: ARM RTEMS Kernel Image (gzip compressed) > Data Size: 55017 Bytes = 53.7 KiB > Load Address: 00008000 > Entry Point: 00008000 > Verifying Checksum ... OK > Uncompressing Kernel Image ... OK > ## Transferring control to RTEMS (at address 00008000) ... > > > *** BEGIN OF TEST HELLO WORLD *** > *** TEST VERSION: > 5.0.0.6eae5860507aa19d30b8ad1464896a5e9208a7bd-modified > *** TEST STATE: EXPECTED-PASS > *** TEST BUILD: RTEMS_DEBUG RTEMS_POSIX_API > *** TEST TOOLS: 7.4.0 20181206 (RTEMS 5, RSB > 0956a2c089faf2600047577bb153afcaaba22288, Newlib 1d35a003f) > Hello World > > *** END OF TEST HELLO WORLD *** > > > *** FATAL *** > fatal source: 5 (RTEMS_FATAL_SOURCE_EXIT) > fatal code: 0 (0x00000000) > RTEMS version: 5.0.0.6eae5860507aa19d30b8ad1464896a5e9208a7bd- > modified > RTEMS tools: 7.4.0 20181206 (RTEMS 5, RSB > 0956a2c089faf2600047577bb153afcaaba22288, Newlib 1d35a003f) > executing thread ID: 0x08a010001 > executing th > > U-Boot 2016.09-rc2-00067-gb615267-dirty (Sep 07 2016 - 17:12:15 +1000) > > DRAM: 128 MiB > RPI 2 Model B (0xa01041) > MMC: bcm2835_sdhci: 0 > reading uboot.env > In: serial > Out: serial > Err: serial > Net: Net Initialization Skipped > No ethernet found. > Hit any key to stop autoboot: 0 > starting USB... > USB0: Core Release: 2.80a > scanning bus 0 for devices... 3 USB Device(s) found > scanning usb for storage devices... 0 Storage Device(s) found > scanning usb for ethernet devices... 1 Ethernet Device(s) found > Run time : 0:00:20.535828 > > Chris _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
