Hi Hans,
hi all,
is the inmate actually supposed to run on bare-metal w/o jailhouse?
Correct UART consoles are set? I'd try to add a very early printk inside
freertos just to check if that part is 'alive'. As you have already
remarked, the UART requires clock gating on bare-metal, while we in
Jailhouse, we may handover a gated uart device.
And then there's paging: AFAIR, u-boot hands over with id-mapped paging
enabled, didn't it? On jailhouse, we hand over with paging completely
disabled.
On 6/6/19 5:52 PM, Johannes Maisch wrote:
> Hello,
> thanks for your assistance. However, we can't boot freertos at the
> moment. I adapted the linker script like this and rebuilt the
> freertos-demo:
>
> ENTRY(vectors)
>
> SECTIONS {
> /* jailhouse arm inmates have to start at address zero */
That comment is no longer up to date - inmates don't have to start at
zero, I added the CONFIG_INMATE_BASE option a while ago, for exactly
this case: it allows to use the same inmates on bare-metal, as well as
as jailhouse guests.
The motivation of my patches were motivated by your exact use-case:
Having the same inmate for both, bare-metal and in jailhouse, is ideal
for benchmarks or comparisons.
Ralf
> . = 0x48000000;
> .boot : { *(.boot) }
>
> . = ALIGN(4096);
> . = . + 0x1000;
> stack_top = .;
> . = . + 0x1000;
> irq_stack_top = .;
> bss_start = .;
> .bss : {
> *(.bss)
> *(COMMON)
> }
>
> after that i tried to boot freertos in u-boot with the following commands:
>
> => load mmc 0:1 0x48000000 freertos-demo.bin
> reading freertos-demo.bin
> 198508 bytes read in 45 ms (4.2 MiB/s)
> => go 0x48000000
>
> But the Freertos-demo still doesn't work. Is there anything else we have
> to do?
>
> Johannes
>
>
> Am 04.06.2019 um 12:27 schrieb Dr. Johann Pfefferl:
>> Hello,
>>
>> the start address can be adapted in the linker script file
>> "lscript.lds".
>>
>> The UART is initialized completely by FreeRTOS itself including the
>> clock gating (hopefully).
>>
>> Hans
>>
>> Jan Kiszka <[email protected]> wrote:
>>> On 04.06.19 11:09, [email protected] wrote:
>>>> Hello,
>>>>
>>>> we want to do a comparison of running FreeRTOS on the Banana Pi with
>>>> Jailhouse and running FreeRTOS bare-metal on the Banana Pi for a
>>>> study-project at Hochschule Esslingen. We were successfull in doing
>>>> this with the Jailhouse hypervisor, but we currently didn't find a
>>>> way to boot FreeRTOS bare-metal on the banana pi. So our question
>>>> is, if there's a way to boot the freertos-demo.bin from the
>>>> freertos-cell bare-metal on the banana pi.
>>>>
>>> Conceptually, you need to make the demo executable at a different
>>> physical
>>> address (it's configured to run from address 0, but RAM starts at
>>> 0x40000000
>>> on the board), and then you could load it there via u-boot and jump
>>> to it.
>>> You also have to ensure that the demo configures its uart itself and
>>> doesn't
>>> rely on the root cell to do anything. I don't recall if that is
>>> already the
>>> case. Hans may tell more about that.
>>>
>>> Jan
>>>
>>> --
>>> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
>>> Corporate Competence Center Embedded Linux
>
>
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