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Pull request for efi-2022-10-rc3-2
Documentation: * improve description of device probing * describe booting RISC-V with KVM and QEMU UEFI * fix Makefile for mkeficapsule -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEbcT5xx8ppvoGt20zxIHbvCwFGsQFAmMA7kkACgkQxIHbvCwF GsQFMw/+JRliitarcCmpkncB7axSwFiGNwm+27+SFl6wwoU+f57Arq2GYsQGWx+H GCnlKNKiPZf1L4aSFG8lueyHs9XK5megHPhL9VtYmQb7gBfNpRQDVW9lKwf4NZOS IkBur1GF79z/wCFermqZ3ozsKEQuh0OzhQ20nsz4GwQIeXpjdACmnqcY4zKEnZYG /aWiP172t2aomTADorNSn3sGqEd3nwPeTUq60uasBz9IGUKR+8rzr8NAfUVotKM5 f2vuRSq85cthls6KBy1+w+k5HDhiS44yutQVol6ZSr4pn8cvkWYagv+L6Otnz/CE NhSyzk22AHzAiz0S44Yjj+4+YM4Qpcoa4zimAqohyrL0SwiZtSlWNBwSlr29vPmb pR4ckrBVCTZQh/ngKHApfqj/Nk7Y2GnydCvdaPW0BEoMVGevTF31JxHJuvmft+yl X9f82fhW/EdiaK/PfQ9Bkp7Ut3ikQQqVgSxRx5ToDXQ3rhfpsswy7WwKn0GPmAzt byQKD68I6YOSwktj8pgtNeORK84itucAtF+KGkhgZxNVokcJRvBs1ZdHnXC4Nb6k gvNFciKnP3arDe5EFyjtiU8WVaBjM+CRH6oOVbjA+26beIg5+jvxznE/CJCcpS7l oJuB6bDg9/AUReZwZYAwQVfTuY1sMpcw3Sf7FTTmo30SfCna2BY= =Fu1m -----END PGP SIGNATURE----- Merge tag 'efi-2022-10-rc3-2' of https://source.denx.de/u-boot/custodians/u-boot-efi Pull request for efi-2022-10-rc3-2 Documentation: * improve description of device probing * describe booting RISC-V with KVM and QEMU UEFI * fix Makefile for mkeficapsule
This commit is contained in:
Tom Rini
commit
e9a4a176de
4 changed files with 54 additions and 27 deletions
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@ -133,6 +133,19 @@ An attached disk can be emulated in RISC-V virt machine by adding::
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You will have to run 'scsi scan' to use it.
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Running with KVM
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----------------
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Running with QEMU using KVM requires an S-mode U-Boot binary as created by
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qemu-riscv64_smode_defconfig.
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Provide the U-Boot S-mode ELF image as *-kernel* parameter and do not add a
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*-bios* parameter, e.g.
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.. code-block:: bash
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qemu-system-riscv64 -accel kvm -nographic -machine virt -kernel u-boot
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Debug UART
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----------
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@ -794,34 +794,53 @@ fall afoul of this rule.
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Activation/probe
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^^^^^^^^^^^^^^^^
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When a device needs to be used, U-Boot activates it, by first reading ofdata
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as above and then following these steps (see device_probe()):
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To save resources devices in U-Boot are probed lazily. U-Boot is a bootloader,
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not an operating system. Many devices are never used during an U-Boot run, and
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probing them takes time, requires memory, may add delays to the main loop, etc.
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The device should be probed by the uclass code or generic device code (e.g.
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device_find_global_by_ofnode()). Uclasses differ but two common use cases can be
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seen:
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1. The uclass is asked to look up a specific device, such as SPI bus 0,
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first chip select - in this case the returned device should be
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activated.
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2. The uclass is asked to perform a specific function on any device that
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supports it, eg. reset the board using any sysreset that can be found -
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for this case the core uclass code provides iterators that activate
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each device before returning it, and the uclass typically implements a
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walk function that iterates over all devices of the uclass and tries
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to perform the requested function on each in turn until succesful.
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To activate a device U-Boot first reads ofdata as above and then follows these
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steps (see device_probe()):
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1. All parent devices are probed. It is not possible to activate a device
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unless its predecessors (all the way up to the root device) are activated.
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This means (for example) that an I2C driver will require that its bus
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be activated.
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unless its predecessors (all the way up to the root device) are activated.
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This means (for example) that an I2C driver will require that its bus
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be activated.
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2. The device's probe() method is called. This should do anything that
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is required by the device to get it going. This could include checking
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that the hardware is actually present, setting up clocks for the
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hardware and setting up hardware registers to initial values. The code
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in probe() can access:
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is required by the device to get it going. This could include checking
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that the hardware is actually present, setting up clocks for the
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hardware and setting up hardware registers to initial values. The code
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in probe() can access:
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- platform data in dev->plat (for configuration)
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- private data in dev->priv (for run-time state)
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- uclass data in dev->uclass_priv (for things the uclass stores
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about this device)
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Note: If you don't use priv_auto then you will need to
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allocate the priv space here yourself. The same applies also to
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plat_auto. Remember to free them in the remove() method.
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Note: If you don't use priv_auto then you will need to
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allocate the priv space here yourself. The same applies also to
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plat_auto. Remember to free them in the remove() method.
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3. The device is marked 'activated'
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4. The uclass's post_probe() method is called, if one exists. This may
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cause the uclass to do some housekeeping to record the device as
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activated and 'known' by the uclass.
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cause the uclass to do some housekeeping to record the device as
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activated and 'known' by the uclass.
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Running stage
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^^^^^^^^^^^^^
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@ -29,7 +29,6 @@ const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
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*
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* @header: EFI object header
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* @ops: EFI disk I/O protocol interface
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* @ifname: interface name for block device
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* @dev_index: device index of block device
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* @media: block I/O media information
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* @dp: device path to the block device
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@ -40,7 +39,6 @@ const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
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struct efi_disk_obj {
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struct efi_object header;
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struct efi_block_io ops;
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const char *ifname;
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int dev_index;
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struct efi_block_io_media media;
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struct efi_device_path *dp;
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@ -379,7 +377,6 @@ static int efi_fs_exists(struct blk_desc *desc, int part)
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*
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* @parent: parent handle
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* @dp_parent: parent device path
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* @if_typename: interface name for block device
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* @desc: internal block device
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* @dev_index: device index for block device
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* @part_info: partition info
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@ -390,7 +387,6 @@ static int efi_fs_exists(struct blk_desc *desc, int part)
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static efi_status_t efi_disk_add_dev(
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efi_handle_t parent,
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struct efi_device_path *dp_parent,
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const char *if_typename,
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struct blk_desc *desc,
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int dev_index,
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struct disk_partition *part_info,
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@ -475,7 +471,6 @@ static efi_status_t efi_disk_add_dev(
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return ret;
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}
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diskobj->ops = block_io_disk_template;
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diskobj->ifname = if_typename;
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diskobj->dev_index = dev_index;
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/* Fill in EFI IO Media info (for read/write callbacks) */
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@ -533,15 +528,13 @@ static int efi_disk_create_raw(struct udevice *dev)
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{
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struct efi_disk_obj *disk;
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struct blk_desc *desc;
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const char *if_typename;
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int diskid;
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efi_status_t ret;
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desc = dev_get_uclass_plat(dev);
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if_typename = blk_get_if_type_name(desc->if_type);
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diskid = desc->devnum;
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ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
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ret = efi_disk_add_dev(NULL, NULL, desc,
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diskid, NULL, 0, &disk);
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if (ret != EFI_SUCCESS) {
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if (ret == EFI_NOT_READY)
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@ -575,7 +568,6 @@ static int efi_disk_create_part(struct udevice *dev)
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{
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efi_handle_t parent;
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struct blk_desc *desc;
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const char *if_typename;
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struct disk_part *part_data;
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struct disk_partition *info;
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unsigned int part;
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@ -589,7 +581,6 @@ static int efi_disk_create_part(struct udevice *dev)
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return -1;
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desc = dev_get_uclass_plat(dev_get_parent(dev));
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if_typename = blk_get_if_type_name(desc->if_type);
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diskid = desc->devnum;
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part_data = dev_get_uclass_plat(dev);
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@ -601,7 +592,7 @@ static int efi_disk_create_part(struct udevice *dev)
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return -1;
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dp_parent = (struct efi_device_path *)handler->protocol_interface;
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ret = efi_disk_add_dev(parent, dp_parent, if_typename, desc, diskid,
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ret = efi_disk_add_dev(parent, dp_parent, desc, diskid,
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info, part, &disk);
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if (ret != EFI_SUCCESS) {
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log_err("Adding partition for %s failed\n", dev->name);
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@ -245,9 +245,13 @@ hostprogs-$(CONFIG_ASN1_COMPILER) += asn1_compiler
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HOSTCFLAGS_asn1_compiler.o = -idirafter $(srctree)/include
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HOSTCFLAGS_mkeficapsule.o += \
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$(shell pkg-config --cflags gnutls uuid 2> /dev/null || echo "")
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$(shell pkg-config --cflags gnutls 2> /dev/null || echo "")
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HOSTCFLAGS_mkeficapsule.o += \
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$(shell pkg-config --cflags uuid 2> /dev/null || echo "")
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HOSTLDLIBS_mkeficapsule += \
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$(shell pkg-config --libs gnutls uuid 2> /dev/null || echo "-lgnutls -luuid")
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$(shell pkg-config --libs gnutls 2> /dev/null || echo "-lgnutls")
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HOSTLDLIBS_mkeficapsule += \
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$(shell pkg-config --libs uuid 2> /dev/null || echo "-luuid")
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hostprogs-$(CONFIG_TOOLS_MKEFICAPSULE) += mkeficapsule
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# We build some files with extra pedantic flags to try to minimize things
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