<div dir="ltr">Hi Gedare, Joel,<div>Unfortunately I do not have access to hw so I cannot test in this environment.</div><div><br></div><div>Do you want me to create the ticket or one of you will take care of it?</div><div><br></div><div>Thanks,</div><div>Eric</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 6, 2018 at 12:02 PM, Gedare Bloom <span dir="ltr"><<a href="mailto:gedare@rtems.org" target="_blank">gedare@rtems.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, Mar 5, 2018 at 5:37 PM, Joel Sherrill <<a href="mailto:joel@rtems.org">joel@rtems.org</a>> wrote:<br>
> Can you file a ticket with the patch attached? We don't change things on a<br>
> release<br>
> branch without a ticket? <a href="http://devel.rtems.org" rel="noreferrer" target="_blank">devel.rtems.org</a><br>
><br>
+1<br>
<br>
> Are you able to test this on real hardware? It touches files in shared which<br>
> will<br>
> be used by multiple powerpc BSPs so it would be good to have feedback on<br>
> real HW.<br>
><br>
+2<br>
<br>
This should be verified on hw before applying especially to a release.<br>
<br>
If it affects hw, also change the comments to just say "greater than<br>
256 MiB" without specifying qemu -m option.<br>
<br>
> FWIW we are trying to wrap up a set of patches for a 4.11 release and it<br>
> would<br>
> be good to have this in the ticket queue for consideration.<br>
><br>
> Thanks.<br>
><br>
> --joel<br>
><br>
><br>
> On Mon, Mar 5, 2018 at 2:31 PM, Éric Tremblay <<a href="mailto:e.tremblay@axis-canada.com">e.tremblay@axis-canada.com</a>><br>
> wrote:<br>
>><br>
>> Hi,<br>
>> I posted a question last week about a strange behavior I was getting using<br>
>> RTEMS with qemu-system-ppc. Anytime I was specifying more than 256Mb of<br>
>> memory using the -m option the RTEMS kernel was not booting. Here is an<br>
>> example of command line I was using:<br>
>><br>
>> qemu-system-ppc -M prep -kernel ./hello.ralf -bios<br>
>> /home/qemu_fakerom/qemu_<wbr>fakerom.bin -cpu 750cxe -nographic -no-reboot -m 384<br>
>><br>
>> Model:<br>
>> Serial:<br>
>> Processor/Bus frequencies (Hz): 300000000/100000000<br>
>> Time Base Divisor: 1000<br>
>> Memory Size: 18000000<br>
>> Residual: 102afd4 (length 27148)<br>
>><br>
>> PCI: Probing PCI hardware<br>
>><br>
>> RTEMS 4.x/PPC load:<br>
>> Uncompressing the kernel...<br>
>> Kernel at 0x00000000, size=0x495b0<br>
>> Initrd at 0x00000000, size=0x0<br>
>> Residual data at 0x0004a000<br>
>> Command line at 0x00051000<br>
>> done<br>
>> Now booting... <<<<<<<<<<<<<<<< execution<br>
>> stuck here<br>
>><br>
>><br>
>> I have spent quite some time debugging this issue and I traced it back to<br>
>> two issues for which I am submitting a patch. Please understand this is my<br>
>> first time using RTEMS and debugging a bootloader so my patch might not be<br>
>> accurate but it does fix the behavior I mentioned above. With this patch I<br>
>> can successfully launch a "Hello World" and specify more memory (-m 512 for<br>
>> example).<br>
>><br>
>> My patch is quite simple since it simply allows the system to access<br>
>> section of memory. Please let me know if this is a suitable correction, if<br>
>> this is totally wrong I would like to know how this could be fixed since our<br>
>> application will use around 512Mb of memory and the current state of things<br>
>> won't work.<br>
>><br>
>> Thank you for your cooperation,<br>
>> Eric<br>
>><br>
>> PS: I am using RTEMS release 4.11.3.<br>
>> I am using Qemu v 2.5.0<br>
>> I am running in a Linux Ubuntu VM (intel 64 bits)<br>
>><br>
>><br>
>><br>
>><br>
>> c/src/lib/libbsp/powerpc/<wbr>shared/start/start.S | 18<br>
>> ++++++++++++++++++<br>
>> c/src/lib/libbsp/powerpc/<wbr>shared/startup/bspstart.c | 18<br>
>> ++++++++++++++++++<br>
>> 2 files changed, 36 insertions(+)<br>
>><br>
>> diff --git a/c/src/lib/libbsp/powerpc/<wbr>shared/start/start.S<br>
>> b/c/src/lib/libbsp/powerpc/<wbr>shared/start/start.S<br>
>> index 729c89c40b..532c1f9ee4 100644<br>
>> --- a/c/src/lib/libbsp/powerpc/<wbr>shared/start/start.S<br>
>> +++ b/c/src/lib/libbsp/powerpc/<wbr>shared/start/start.S<br>
>> @@ -93,6 +93,24 @@ __rtems_entry_point:<br>
>> mtspr IBAT0L,r8<br>
>> mtspr IBAT0U,r11<br>
>> isync<br>
>> +/* Map section where residual is located if outside<br>
>> + * the first 256Mb of RAM. This is to support cases<br>
>> + * where the user supplies the -m option with Qemu<br>
>> + * in order to have more memory available to the system.<br>
>> + */<br>
>> + mr r9, r1 /* Get where residual was mapped */<br>
>> + lis r12,0xf0000000@h<br>
>> + and r9,r9,r12<br>
>> + cmpi 0,1,r9, 0<br>
>> + beq skip_BAT1_config<br>
>> + isync<br>
>> + ori r11,r9,0x1ffe<br>
>> + mtspr DBAT1L,r8 /* N.B. 6xx (not 601) have valid */<br>
>> + mtspr DBAT1U,r11 /* bit in upper BAT register */<br>
>> + mtspr IBAT1L,r8<br>
>> + mtspr IBAT1U,r11<br>
>> + isync<br>
>> +skip_BAT1_config:<br>
>><br>
>> /*<br>
>> * we now have the 1st 256M of ram mapped with the bats. We are still<br>
>> diff --git a/c/src/lib/libbsp/powerpc/<wbr>shared/startup/bspstart.c<br>
>> b/c/src/lib/libbsp/powerpc/<wbr>shared/startup/bspstart.c<br>
>> index 5a97cc8531..f80835b117 100644<br>
>> --- a/c/src/lib/libbsp/powerpc/<wbr>shared/startup/bspstart.c<br>
>> +++ b/c/src/lib/libbsp/powerpc/<wbr>shared/startup/bspstart.c<br>
>> @@ -300,6 +300,24 @@ void bsp_start( void )<br>
>> */<br>
>> _BSP_clear_hostbridge_errors(0 /* enableMCP */, 0/*quiet*/);<br>
>><br>
>> + if (BSP_mem_size > 0x10000000)<br>
>> + {<br>
>> + /* Support cases with qemu supplied -m option and mem size larger than<br>
>> 256Mb.<br>
>> + *<br>
>> + * We use BAT3 in order to obtain access to the top section of the<br>
>> RAM.<br>
>> + * We also need to do this just before setting up the page table<br>
>> because<br>
>> + * this is where the page table will be located.<br>
>> + */<br>
>> + const unsigned int mem256Count = (BSP_mem_size / 0x10000000);<br>
>> + const unsigned int BAT3Addr = ((BSP_mem_size % 0x10000000) ?<br>
>> + (mem256Count * 0x10000000) :<br>
>> + ((mem256Count-1) * 0x10000000));<br>
>> + setdbat(3, BAT3Addr, BAT3Addr, 0x10000000, IO_PAGE);<br>
>> +#ifdef SHOW_MORE_INIT_SETTINGS<br>
>> + printk("Setting up BAT3 for large memory support. (BAT3 --><br>
>> 0x%x)\n", BAT3Addr);<br>
>> +#endif<br>
>> + }<br>
>> +<br>
>> /* Allocate and set up the page table mappings<br>
>> * This is only available on >604 CPUs.<br>
>> *<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>><br>
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><br>
><br>
><br>
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</blockquote></div><br></div>