Dear L4Re experts,
I hope you are doing well and enjoying this time of the year.
I would like to ask for your help or insights on how to use the emmc-driver in
an imx8mp based board.
In this platform, the usdhc nodes are located out of the pci bus, and they
require an i2c device to work, as well as gpio and clocks.
I am able to start the emmc server, which identifies one usdhc device and
starts the server loop. I pass a virtual bus to the emmc driver with all
required devices, as they usually work in the Virtual Machine to access the
mmc. The driver scans all of them, finding the usdhc node.
But, everything stops when I create a client, either using a dynamic way with:
create(0, "device=...","ds-max=5); or declaring the client in the argument as:
"emmc-drv -v --client cl1 --device=... --ds-max=5". For the second way, it
stops when the Virtual Machine starts to configure the related virtio device (I
am using a virtio_net node).
I will be grateful if you can give me some information about the issue or some
of the following questions:
1. how should the node in the device tree of the Virtual Machine be
configured to work with the emmc client?
2. is it possible that the board's specific hardware configuration required
for the mmc is stopping the emmc client to work?
3. Is there any way to test the driver before linking it to a virtual
machine? I found an example with the "virtio-block-chksum-sync" module, but I
could not find this module.
I attach the configuration files, the output text and the base device tree
structure. Thank you in advance for your attention.
Kind regards,
Alvaro Gallardo
------- OUTPUT ----- MOE: Hello world MOE: found 1911604 KByte free memory MOE: found RAM from 40200000 to b8600000 MOE: allocated 1924 KByte for the page array @0x40205000 MOE: virtual user address space [0-ffffffffff] MOE: cmdline: moe rom/emmc-test.ned MOE: rom name space cap -> [C:103000] MOE: rwfs name space cap -> [C:105000] ROMFS: [4395d000-4395dc93] [C:107000] emmc-test.ned ROMFS: [4395e000-43a622a0] [C:109000] uvmm ROMFS: [43a63000-43a80a08] [C:10b000] l4re ROMFS: [43a81000-43b0d288] [C:10d000] ned ROMFS: [43b0e000-43b0f425] [C:10f000] vmm.lua ROMFS: [43b10000-43d3aff0] [C:111000] io ROMFS: [43d3b000-43d3e762] [C:113000] io-karo-eth.io ROMFS: [43d3f000-43d3fc93] [C:115000] emmc-test.ned ROMFS: [43d40000-43d40432] [C:116000] emmc.vbus ROMFS: [43d41000-43d4135b] [C:118000] vm_hw2.vbus ROMFS: [43d42000-4684e200] [C:11a000] Image ROMFS: [4684f000-46ef73e4] [C:11c000] alonerd.gz ROMFS: [46ef8000-46efe864] [C:11e000] virt.dtb ROMFS: [46eff000-46fd6600] [C:120000] emmc-drv ROMFS: [46fd7000-4701f430] [C:122000] cons MOE: Starting: rom/ned rom/emmc-test.ned MOE: loading 'rom/ned' Ned says: Hi World! Ned: loading file: 'rom/emmc-test.ned' Console Server cons> Created vcon channel: io [420010] cons> Created vcon channel: emmc [421010] cons> io | Io service emmc | eMMC[main]: Emmc driver says hello. emmc | eMMC[main]: TSC frequency of 8MHz. io | Ready. Waiting for request. emmc | eMMC[main]: Starting device discovery. emmc | eMMC[main]: Scanning child 0x1 (L4ICU). emmc | eMMC[main]: Scanning child 0x2 (pinctrl_30330000). emmc | eMMC[main]: Scanning child 0x3 (gpio_30230000). emmc | eMMC[main]: Scanning child 0x4 (i2c1). emmc | eMMC[main]: Scanning child 0x5 (mmc1). emmc | eMMC[]: Using VBUS global DMA domain. emmc | eMMC[main]: Device @ 30b50000: interrupt: 55, level-high-triggered. emmc | eMMC[main]: Assuming host clock of 200MHz. io | vbus emmc does not support a global DMA domain emmc | eMMC[main]: No such object found: Assignment of DMA domain.. Skipping. emmc | eMMC[main]: Scanning child 0x6 (gpio_30240000). emmc | eMMC[main]: Scanning child 0x7 (TIMER). emmc | eMMC[main]: Scanning child 0x8 (gpio_30220000). emmc | eMMC[main]: Scanning child 0x9 (gpio_30210000). emmc | eMMC[main]: Scanning child 0xa (BUS_308). emmc | eMMC[main]: Scanning child 0xb (i2c4). emmc | eMMC[main]: Scanning child 0xc (i2c3). emmc | eMMC[main]: Scanning child 0xd (bus_30000000). emmc | eMMC[main]: Scanning child 0xe (i2c2). emmc | eMMC[main]: Scanning child 0xf (bus_30400000). emmc | eMMC[main]: Scanning child 0x10 (gpio_30200000). emmc | eMMC[main]: Scanning child 0x11 (bus_32c00000). emmc | eMMC[main]: Scanning child 0x12 (reset_controller_30390000). emmc | eMMC[main]: All devices scanned. emmc | eMMC[main]: Entering server loop.
hw-passmmc.dts
Description: hw-passmmc.dts
io-karo-eth.io
Description: io-karo-eth.io
emmc-test.ned
Description: emmc-test.ned
emmc.vbus
Description: emmc.vbus
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