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 */
. = 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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