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[ot] docs/opentitan: update Earlgrey doc, create Darjeeling documenta…
…tion Signed-off-by: Emmanuel Blot <[email protected]>
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| # Darjeeling CW310 | ||
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| ## Supported version | ||
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| Please check out `hw/opentitan/ot_ref.log` | ||
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| ## Supported features | ||
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| * ePMP | ||
| * Zbr ISA extension (crc32 instructions) | ||
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| ## Supported devices | ||
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| ### Near feature-complete devices | ||
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| * AES | ||
| * missing side-loading | ||
| * AON Timer | ||
| * CSRNG | ||
| * EDN | ||
| * HMAC | ||
| * JTAG (compatible with OpenOCD/Spike "remote bitbang" protocol) | ||
| * Mailbox | ||
| * [JTAG mailbox](jtagmbx.md) can be accessed through JTAG using a DM-TL bridge | ||
| * OTBN | ||
| * missing side-loading | ||
| * OTP controller | ||
| * read and write features are supported, Present scrambling is supported w/ digest checks, | ||
| ECC bits are ignored | ||
| * SPI data flash (from QEMU upstream w/ fixes) | ||
| * SPI Host controller | ||
| * HW bus config is ignored (SPI mode, speed, ...) | ||
| * Timer | ||
| * UART | ||
| * missing RX timeout, break support | ||
| * bitrate is not paced vs. selected baurate | ||
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| ### Partially implemented devices | ||
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| Devices in this group implement subset(s) of the real HW. | ||
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| * DMA | ||
| * Only memory-to-memory transfers (inc. hashing) are supported, Handshake modes are not supported | ||
| * Flash controller | ||
| * read-only features only | ||
| * Entropy Src | ||
| * test/health features are not supported | ||
| * [GPIO](gpio.md) | ||
| * A CharDev backend can be used to get GPIO outputs and update GPIO inputs, | ||
| * KMAC | ||
| * Side loading is not supported | ||
| * Lifecycle controller | ||
| * Escalation is not supported | ||
| * Power Manager | ||
| * Fast FSM is partially supported, Slow FSM is bypassed | ||
| * Interactions with other devices (such as the Reset Manager) are limited | ||
| * [ROM controller](rom_ctrl.md) | ||
| * SoC Proxy only supports IRQ routing/gating | ||
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| ### Sparsely implemented devices | ||
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| In this group, device CSRs are supported (w/ partial or full access control & masking) but only some | ||
| features are implemented. | ||
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| * AST | ||
| * entropy source only (from host source) | ||
| * Clock Manager | ||
| * Clock hints only | ||
| * Ibex wrapper | ||
| * random source (connected to CSR), FPGA version, virtual remapper, fetch enable can be controlled | ||
| from Power Manager | ||
| * Reset Manager | ||
| * HW and SW reset requests are supported | ||
| * SRAM controller | ||
| * Supported as dummy SRAM memories | ||
|
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| ### Dummy devices | ||
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| Devices in this group are mostly implemented with a RAM backend or real CSRs but do not implement | ||
| any useful feature (only allow guest test code to execute as expected). | ||
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| * Alert controller | ||
| * Key manager | ||
| * Pinmux | ||
| * Sensor | ||
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| ### Additional devices | ||
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| * [DevProxy](devproxy.md) is a CharDev-enabled component that can be remotely controlled to enable | ||
| communication with the system-side buses of the mailboxes and DMA devices. A Python library is | ||
| available as `scripts/opentitan/devproxy.py` and provide an API to remote drive the devproxy | ||
| communication interface. | ||
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| ## Running the virtual machine | ||
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| ### Arbitrary application | ||
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| ````sh | ||
| qemu-system-riscv32 -M ot-darjeeling,no_epmp_cfg=true -display none -serial mon:stdio \ | ||
| -global ot-ibex_wrapper-dj.lc-ignore=on -kernel hello.elf | ||
| ```` | ||
| See the section "Useful execution options" for documentation about the `no_epmp_cfg` and | ||
| `ot-ibex_wrapper-dj.lc-ignore=on` option. | ||
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| ### Boot sequence ROM, ROM_EXT, BLO | ||
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| ````sh | ||
| qemu-system-riscv32 -M ot-darjeeling -display none -serial mon:stdio \ | ||
| -object ot-rom-img,id=rom,file=rom_with_fake_keys_fpga_cw310.elf,digest=fake \ | ||
| -drive if=pflash,file=otp-rma.raw,format=raw \ | ||
| -drive if=mtd,bus=1,file=flash.raw,format=raw | ||
| ```` | ||
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| where `otp-rma.raw` contains the RMA OTP image and `flash.raw` contains the signed binary file of the | ||
| ROM_EXT and the BL0. See [`otptool.py`](otptool.md) and [`flashgen.py`](flashgen.md) tools to | ||
| generate the `.raw` image files. | ||
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| See [`rom_ctrl.md`](rom_ctrl.md) for information on ROM option. | ||
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| ## Tools | ||
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| See [`tools.md`](tools.md) | ||
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| ## Useful execution options | ||
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| ### vCPU | ||
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| * `-icount 6` reduces the execution speed of the vCPU (Ibex core) to 1GHz >> 6, _i.e._ ~15MHz, | ||
| which should roughly match the expected speed of the Ibex core running on the CW310 FPGA, which | ||
| is set to 10 MHz. This option is very useful/mandatory to run many OpenTitan tests that rely on | ||
| time or CPU cycle to validate features. Using `-icount` option slows down execution speed though, | ||
| so it is not recommended to use it when the main goal is to develop SW to run on the virtual | ||
| machine. | ||
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| * `no_epmp_cfg=true` can be appended to the machine option switch, _i.e._ | ||
| `-M ot-darjeeeling,no_epmp_cfg=true` to disable the initial ePMP configuration, which can be very | ||
| useful to execute arbitrary code on the Ibex core without requiring an OT ROM image to boot up. | ||
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| * `-global ot-ibex_wrapper-dj.lc-ignore=on` should be used whenever no OTP image is provided, or if | ||
| the current LifeCycle state stored in the OTP image does not allow the Ibex core to fetch data. | ||
| This switch forces the Ibex core to execute whatever the LifeCycle broadcasted signal, which | ||
| departs from the HW behavior but maybe helpful to run the machine without a full OTP set up. The | ||
| alternative to allow the Ibex core to execute guest code is to provide a valid OTP image with one | ||
| of the expected LifeCycle state, such as TestUnlock*, Dev, Prod or RMA. | ||
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| * `-cpu lowrisc-ibex,x-zbr=false` can be used to force disable the Zbr experimental-and-deprecated | ||
| RISC-V bitmap extension for CRC32 extension. | ||
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| ### AES | ||
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| * `-global ot-aes.fast-mode=false` can be used to better emulate AES HW IP, as some OT tests expect | ||
| the Ibex core to execute while the HW is performing AES rounds. Without this option, the virtual | ||
| HW may only give back execution to the vCPU once the AES operation is complete, which make those | ||
| OT tests to fail. Disabling fast mode better emulates the HW to the expense of higher AES latency | ||
| and throughput. | ||
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| ### Display | ||
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| * `-display none` can be used to prevent QEMU to open a semi-graphical windows as the default | ||
| console, and use the current shell instead. | ||
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| ### Flash | ||
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| * `-drive if=mtd,bus=1,file=<filename>,format=raw` should be used to specify a path to a QEMU RAW | ||
| image file used as the OpenTitan internal flash controller image. This _RAW_ file should have | ||
| been generated with the [`flashgen.py`](flashgen.md) tool. | ||
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| Note: for now, bus 1 is assigned to the internal controller with the embedded flash storage. See | ||
| also SPI Host section. | ||
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| ### OTBN | ||
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| * `-global ot-otbn.logfile=<filename>` dumps executed instructions on OTBN core into the specified | ||
| filename. Beware that is even further slows down execution speed, which could likely result into | ||
| guest application on the Ibex core to time out. | ||
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| ### OTP | ||
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| * `-drive if=pflash,file=otp.raw,format=raw` should be used to specify a path to a QEMU RAW image | ||
| file used as the OpenTitan OTP image. This _RAW_ file should have been generated with the | ||
| [`otptool.py`](otptool.md) tool. | ||
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| ### SPI Host | ||
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| * `-drive if=mtd,bus=0,file=<filename>,format=raw` should be used to specify a path to a QEMU RAW | ||
| image file used as the ISSP IS25WP128 SPI data flash backend file. This _RAW_ file should have | ||
| been created with the qemu-img tool. There is no dedicated tool to populate this image file for | ||
| now. | ||
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| ````sh | ||
| qemu-img create -f raw spi.raw 16M | ||
| ```` | ||
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| For now, bus 0 is assigned to the SPI Host controller with an external flash storage. See also | ||
| Flash controller section. | ||
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| ### UART | ||
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| * `-serial mon:stdio`, used as the first `-serial` option, redirects the virtual UART0 to the | ||
| current console/shell. | ||
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| * `-chardev socket,id=serial1,host=localhost,port=8001,server=on,wait=off` and | ||
| `-serial chardev:serial1` can be used to redirect UART1 (in this example) to a TCP socket. These | ||
| options are not specific to OpenTitan emulation, but are useful to communicate over a UART. | ||
| Note that QEMU offers many `chardev` backends, please check QEMU documentation for details. | ||
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| ## Useful debugging options | ||
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| ### Device log traces | ||
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| Most OpenTitan virtual devices can emit log traces. To select which traces should be logged, a plain | ||
| text file can be used along with QEMU `-trace` option. | ||
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| To populate this file, the easiest way is to dump all available traces and filter them with a | ||
| pattern, for example to get all OpenTitan trace messages: | ||
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| ````sh | ||
| qemu-system-riscv32 -trace help | grep -E '^ot_' > ot_trace.log | ||
| qemu-system-riscv32 -trace events=ot_trace.log -D qemu.log ... | ||
| ```` | ||
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| * It is *highly* recommended to use the `-D` option switch when any `-trace` or `-d` (see below) is | ||
| selected, to avoid saturating the standard output stream with traces and redirect them into the | ||
| specified log file. | ||
|
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| ### QEMU log traces | ||
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| QEMU provides another way of logging execution of the virtual machine using the `-d` option. Those | ||
| log messages are not tied to a specific device but rather to QEMU features. `-d help` can be used | ||
| to enumerate these log features, however the most useful ones are enumerated here: | ||
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| * `unimp` reports log messages for unimplemented features, _e.g._ when the vCPU attempts to | ||
| read from or write into a memory mapped device that has not been implemented. | ||
| * `guest_errors` reports log messages of invalid guest software requests, _e.g._ attempts to | ||
| perform an invalid configuration. | ||
| * `int` reports all interruptions *and* exceptions handled by the vCPU. It may be quite verbose | ||
| but also very useful to track down an invalid memory or I/O access for example. This is the | ||
| first option to use if the virtual machine seems to stall on start up. | ||
| * `in_asm` reports the decoded vCPU instructions that are translated by the QEMU TCG, _i.e._ here | ||
| the RISC-V instructions. Note that transcoded instructions are cached and handled by blocks, | ||
| so the flow of transcoded instruction do not exactly reflect the stream of the executed guest | ||
| instruction, e.g. may only appear once in a loop. Use the next log option, `exec`, to get | ||
| more detailed but also much more verbose log traces. | ||
| * `exec` reports the vCPU execution stream. | ||
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| Those options should be combined with a comma separator, _e.g._ `-d unimp,guest_errors,int` | ||
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| `in_asm` option may be able to report the name of the guest executed function, as long as the guest | ||
| application symbols have been loaded. This is the case when the `-kernel` option is used to load | ||
| an ELF non-stripped file. Unfortunately, this feature is not available for guest applications that | ||
| are loaded from a raw binary file (`.bin`, `.signed.bin`, ...). However the | ||
| [`flashgen.py`](flashgen.md) script implements a workaround for this feature, please refer to this | ||
| script for more details. | ||
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| Finally, a Rust demangler has been added to QEMU, which enables the QEMU integrated dissambler to | ||
| emit the demangled names of the Rust symbols for Rust-written guest applications rather than their | ||
| mangled versions as stored in the ELF file. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| # OT GPIO | ||
| # OpenTitan GPIO | ||
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| ## Initial configuration | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| # SPI Device support | ||
| # OpenTitan SPI Device support | ||
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| ## Supported modes | ||
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