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software_dfu #46

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sb10q merged 8 commits from software_dfu into master 2021-01-13 11:59:06 +08:00
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src/dfu.rs
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@ -3,6 +3,7 @@ use cortex_m_rt::{pre_init};
const DFU_TRIG_MSG: u32 = 0xDECAFBAD;
sb10q commented 2021-01-12 16:39:28 +08:00
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This can and should be automatically obtained via a linker symbol. See this example:
https://git.m-labs.hk/M-Labs/artiq-zynq/src/branch/master/src/runtime/src/kernel/core1.rs#L31-L36
https://git.m-labs.hk/M-Labs/artiq-zynq/src/branch/master/src/runtime/link.x#L10

This can and should be automatically obtained via a linker symbol. See this example: https://git.m-labs.hk/M-Labs/artiq-zynq/src/branch/master/src/runtime/src/kernel/core1.rs#L31-L36 https://git.m-labs.hk/M-Labs/artiq-zynq/src/branch/master/src/runtime/link.x#L10
topquark12 commented 2021-01-12 16:59:47 +08:00
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The linker currently does not actually do anything to the ram carved out for the dfu trigger message, and I beleive there's no symbol generated for that chunk of memory.

I think I'll have to find the linker script the project is using, fork a copy, generate a symbol for that addr and use it in our project somehow.

The linker currently does not actually do anything to the ram carved out for the dfu trigger message, and I beleive there's no symbol generated for that chunk of memory. I think I'll have to find the linker script the project is using, fork a copy, generate a symbol for that addr and use it in our project somehow.
sb10q commented 2021-01-12 17:02:53 +08:00
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Indeed, but the linker script can be modified so that such a symbol is generated. This way there isn't any value that needs to be manually synchronized in two places. You may not even need to hardcode the address; the linker could place that variable automatically.

Indeed, but the linker script can be modified so that such a symbol is generated. This way there isn't any value that needs to be manually synchronized in two places. You may not even need to hardcode the address; the linker could place that variable automatically.
sb10q commented 2021-01-12 17:04:05 +08:00
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Though hardcoding is actually more reliable since after a firmware update the address could have changed otherwise... add a comment that explains that.

Though hardcoding is actually more reliable since after a firmware update the address could have changed otherwise... add a comment that explains that.
sb10q commented 2021-01-12 17:04:35 +08:00
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The linker script is the second link I gave you.

The linker script is the second link I gave you.
pca006132 commented 2021-01-12 17:09:07 +08:00
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I think specifying a region that only contains the DFU msg would be reasonable. This way the address would not be changed after update.

I think specifying a region that only contains the DFU msg would be reasonable. This way the address would not be changed after update.
topquark12 commented 2021-01-12 17:10:19 +08:00
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I thought that linker script is for a zynq? I am not sure where the linker script currently being used is placed, think it is packaged with one of the rust modules.

I thought that linker script is for a zynq? I am not sure where the linker script currently being used is placed, think it is packaged with one of the rust modules.
sb10q commented 2021-01-12 17:11:57 +08:00
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Okay, you mean the thermostat linker script.
That memory.x you modified can be used, as you can see it already defines the _stack_start symbol.

Okay, you mean the thermostat linker script. That ``memory.x`` you modified can be used, as you can see it already defines the ``_stack_start`` symbol.
topquark12 commented 2021-01-12 17:19:12 +08:00
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The stack is on CCM, the message is placed in RAM. I can try placing the msg in CCM, not sure what the reset behavior of CCM is yet.

The stack is on CCM, the message is placed in RAM. I can try placing the msg in CCM, not sure what the reset behavior of CCM is yet.
topquark12 commented 2021-01-12 17:22:56 +08:00
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@pca006132 There's already a dedicated region specified in memory.x . Though the linker does not do anything with that region, and I don't think the linker generates a symbol for that space.

I also haven't found the linker script of the project just yet.

@pca006132 There's already a dedicated region specified in memory.x . Though the linker does not do anything with that region, and I don't think the linker generates a symbol for that space. I also haven't found the linker script of the project just yet.
pca006132 commented 2021-01-12 17:35:08 +08:00
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The linker script is defined in cortex-m-rt, https://github.com/rust-embedded/cortex-m-rt/blob/master/link.x.in
But I'm not familiar with that, not sure how to add new symbols.

The linker script is defined in `cortex-m-rt`, https://github.com/rust-embedded/cortex-m-rt/blob/master/link.x.in But I'm not familiar with that, not sure how to add new symbols.
sb10q commented 2021-01-12 17:37:22 +08:00
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@topquark12 what's wrong with simply adding

_dfu_msg = ORIGIN(DFU_MSG)

at the end of thermostat's memory.x?

@topquark12 what's wrong with simply adding ``` _dfu_msg = ORIGIN(DFU_MSG) ``` at the end of thermostat's ``memory.x``?
extern "C" {
// This symbol comes from memory.x
sb10q commented 2021-01-13 11:07:37 +08:00
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Why not put it outside the functions so this declaration can be shared?

Why not put it outside the functions so this declaration can be shared?
static mut _dfu_msg: u32;
}