It looks like the libplatsupport drivers do this enabling as well. Though it appears there's a typo in the transmit enable:
https://github.com/seL4/util_libs/blob/master/libplatsupport/src/plat/zynq7000/serial.c#L174 I've created a pull request to fix that as well. https://github.com/seL4/util_libs/pull/5 -Andrew On Tue, Dec 6, 2016 at 6:46 PM, Andrew Gacek <[email protected]> wrote: > Ok thanks. I've created a pull request for this change: > > https://github.com/seL4/seL4_tools/pull/2 > > -Andrew > > On Tue, Dec 6, 2016 at 5:58 PM, <[email protected]> wrote: >> Hi Andrew, >> >> Nice find! U-boot obviously performs some initialisation of the UART on >> our behalf, hence we have not had problems when testing on real >> hardware. >> >> The correct place would be here: >> https://github.com/seL4/seL4_tools/blob/2.0.x-compatible/elfloader-tool/src/arch-arm/plat-zynq7000/platform_init.c#L72 >> >> But, it should call out to a dedicated init function in sys_fputc.c >> >> The call to platform_init() would also need to occur a few lines >> earlier, before the first printf: >> https://github.com/seL4/seL4_tools/blob/2.0.x-compatible/elfloader-tool/src/arch-arm/boot.c#L81 >> >> - Alex >> >> >> On Tue, 2016-12-06 at 16:35 -0600, Andrew Gacek wrote: >>> I've found the problem. First, the default UART for zynq7000 is the >>> second one, so I need to run qemu like this: >>> >>> qemu-system-arm -M xilinx-zynq-a9 -kernel >>> images/capdl-loader-experimental-image-arm-zynq7000 -m size=512M >>> -monitor none -nographic -serial /dev/null -serial stdio >>> >>> Second, the Zynq7000 uart needs to be explicitly enabled. This is done >>> by clearing bit 5 and setting bit 4 of the control register. It looks >>> like seL4 and related tools are not doing this. For now I've done this >>> by modifying >>> >>> tools/elfloader/src/arch-arm/plat-zynq7000/sys_fputc.c >>> >>> to add >>> >>> uint32_t v = *UART_REG(UART_CONTROL); >>> v |= (1 << 4); >>> v &= ~(1 << 5); >>> *UART_REG(UART_CONTROL) = v; >>> >>> to the __fputc function. >>> >>> This clearly isn't the right spot for it. Where should such initial >>> configuration be done? >>> >>> -Andrew >>> >>> >>> On Tue, Dec 6, 2016 at 3:33 PM, Andrew Gacek <[email protected]> wrote: >>> > If I suspend the execution in QEMU, the program counter is at >>> > 0xe00108ec. In the kernel, that is the <idle_thread> method. So >>> > perhaps the system is running, but I'm just not able to see any output >>> > from the elfloader, kernel, etc. >>> > >>> > -Andrew >>> > >>> > On Tue, Dec 6, 2016 at 2:49 PM, Andrew Gacek <[email protected]> >>> > wrote: >>> >> Thanks Alex. That fixes the crash. Now the system runs but just seems >>> >> to hang without doing anything. I don't get any output at all (whereas >>> >> the kzm version spews out a ton of messages). In 'top' I can see it's >>> >> using about 3% cpu so it's something, though it's not clear what. It's >>> >> hard for me to tell. Perhaps the UART for the console isn't working >>> >> correctly? >>> >> >>> >> -Andrew >>> >> >>> >> On Tue, Dec 6, 2016 at 2:46 PM, <[email protected]> wrote: >>> >>> Hi Andrew, >>> >>> >>> >>> It could be because QEMU does not know how much RAM is available. >>> >>> Could you try adding "-m size=512M" to your arguments? >>> >>> >>> >>> - Alex >>> >>> >>> >>> ________________________________________ >>> >>> From: Devel <[email protected]> on behalf of Andrew Gacek >>> >>> <[email protected]> >>> >>> Sent: Wednesday, December 7, 2016 2:23 AM >>> >>> To: [email protected] >>> >>> Subject: [seL4] seL4 on Zinq7000 on QEMU >>> >>> >>> >>> I'm trying to build and emulate a version of seL4 for the zinq7000 >>> >>> platform, but it crashes immediately. >>> >>> >>> >>> I've started by taking the camkes tutorial and building it for zinq7000: >>> >>> >>> >>> repo init -u https://github.com/seL4/camkes-manifest.git >>> >>> repo sync >>> >>> make arm_simple_defconfig >>> >>> make menuconfig # change seL4 platform to zinq7000 >>> >>> make >>> >>> >>> >>> When I try to emulate it, it crashes right away: >>> >>> >>> >>> qemu-system-arm -M xilinx-zynq-a9 -nographic -kernel >>> >>> images/capdl-loader-experimental-image-arm-zynq7000 >>> >>> >>> >>> qemu: fatal: Trying to execute code outside RAM or ROM at 0x10000000 >>> >>> >>> >>> R00=00000000 R01=00000000 R02=00000000 R03=00000000 >>> >>> R04=00000000 R05=00000000 R06=00000000 R07=00000000 >>> >>> R08=00000000 R09=00000000 R10=00000000 R11=00000000 >>> >>> R12=00000000 R13=00000000 R14=00000000 R15=10000000 >>> >>> PSR=400001d3 -Z-- A svc32 >>> >>> s00=00000000 s01=00000000 d00=0000000000000000 >>> >>> s02=00000000 s03=00000000 d01=0000000000000000 >>> >>> s04=00000000 s05=00000000 d02=0000000000000000 >>> >>> s06=00000000 s07=00000000 d03=0000000000000000 >>> >>> s08=00000000 s09=00000000 d04=0000000000000000 >>> >>> s10=00000000 s11=00000000 d05=0000000000000000 >>> >>> s12=00000000 s13=00000000 d06=0000000000000000 >>> >>> s14=00000000 s15=00000000 d07=0000000000000000 >>> >>> s16=00000000 s17=00000000 d08=0000000000000000 >>> >>> s18=00000000 s19=00000000 d09=0000000000000000 >>> >>> s20=00000000 s21=00000000 d10=0000000000000000 >>> >>> s22=00000000 s23=00000000 d11=0000000000000000 >>> >>> s24=00000000 s25=00000000 d12=0000000000000000 >>> >>> s26=00000000 s27=00000000 d13=0000000000000000 >>> >>> s28=00000000 s29=00000000 d14=0000000000000000 >>> >>> s30=00000000 s31=00000000 d15=0000000000000000 >>> >>> s32=00000000 s33=00000000 d16=0000000000000000 >>> >>> s34=00000000 s35=00000000 d17=0000000000000000 >>> >>> s36=00000000 s37=00000000 d18=0000000000000000 >>> >>> s38=00000000 s39=00000000 d19=0000000000000000 >>> >>> s40=00000000 s41=00000000 d20=0000000000000000 >>> >>> s42=00000000 s43=00000000 d21=0000000000000000 >>> >>> s44=00000000 s45=00000000 d22=0000000000000000 >>> >>> s46=00000000 s47=00000000 d23=0000000000000000 >>> >>> s48=00000000 s49=00000000 d24=0000000000000000 >>> >>> s50=00000000 s51=00000000 d25=0000000000000000 >>> >>> s52=00000000 s53=00000000 d26=0000000000000000 >>> >>> s54=00000000 s55=00000000 d27=0000000000000000 >>> >>> s56=00000000 s57=00000000 d28=0000000000000000 >>> >>> s58=00000000 s59=00000000 d29=0000000000000000 >>> >>> s60=00000000 s61=00000000 d30=0000000000000000 >>> >>> s62=00000000 s63=00000000 d31=0000000000000000 >>> >>> FPSCR: 00000000 >>> >>> Aborted >>> >>> >>> >>> >>> >>> Is there something I'm doing wrong? >>> >>> >>> >>> Thanks, >>> >>> Andrew >>> >>> >>> >>> _______________________________________________ >>> >>> Devel mailing list >>> >>> [email protected] >>> >>> https://sel4.systems/lists/listinfo/devel >> _______________________________________________ Devel mailing list [email protected] https://sel4.systems/lists/listinfo/devel
