Merge branch '2022-04-01-arm-semihosting-cleanups-and-new-features' into next

This brings in two related series.  The first from Andre:

This series is the continuation of last year's effort to support the new
Armv8-R64 application profile. This led to a significant rework of the
existing fastmodel (FVP) support, to both upgrade it to newest U-Boot
standards (OF_CONTROL and distro_boot support), but also to generalise
the code, so that plugging in the v8-R64 support in the last patch gets
much easier. This is because apart from the twisted memory map between
the two profiles there is actually little difference, when it comes to
U-Boot relevant parts of the hardware.

I kept the legacy semihosting support (which picks up magic files from
the current directory), but if that fails, we go and try virtio-blk
(.iso installer images work), then virtio-net.

Please have a look, and give it a try, if possible. Both the v8-R and
v8-A FVP models are available for free on the Arm website[1].

Patch 01/11 fixes a regression introduced in December, it should be
applied now. The rest of the patches are for the next merge window.

[1]
https://developer.arm.com/tools-and-software/simulation-models/fast-models

And the second from Sean (where we exclude 27, 28 and 29 for now):
This cleans up the semihosting code and adds the following new features:

- hostfs support (like sandbox)
- support for being used as a SPL boot device
- serial device support
- falling back to normal drivers if semihosting is disabled

The main device affected by these changes is vexpress64, so I'd
appreciate
if Andre (or anyone else) could try booting.

These changes are motivated by bringup for ls1046a. When forcing JTAG
boot, this device disables most communication peripherals, including
serial and ethernet devices. This appears to be fixed in later
generation devices, but we are stuck with it for now. Semihosting
provides an easy way to run a few console commands.

The patches in this series are organized as follows:

0-4: rST conversions and other documentation updates
5-9: Semihosting cleanups
10-14: Filesystem support (including SPL boot device)
15-16: Serial support
16: Documentation update
17: JTAG boot support for LS1046A
19-25: Semihosting fallback
26-29: DM puts support

The last two groups of patches are "bonus;" the first 17 patches stand
on their own. The last two groups could be broken out as separate
series, but I have kept them in this one to help with my sanity (and not
have to deal with too many outstanding series).

Patch 14 depends on [1] to apply cleanly. Patch 17 depends on [2] for
correctness. This series should be applied to u-boot/next (in
particular, the EROFS series must have been applied).

[1]
https://lore.kernel.org/u-boot/CACRpkdZ+9fmNjC_mvrbPa9-iuTQVd8UkJ7Zpe7cL0c5vZygsVw@mail.gmail.com/T/
[2]
https://lore.kernel.org/u-boot/20220222183840.1355337-2-sean.anderson@seco.com/

3 files changed, 21 insertions, 56 deletions

diff --git a/configs/vexpress_aemv8a_juno_defconfig b/configs/vexpress_aemv8a_juno_defconfig
index 76a851c..374fa32 100644
--- a/configs/vexpress_aemv8a_juno_defconfig
+++ b/configs/vexpress_aemv8a_juno_defconfig
@@ -1,55 +1,30 @@
 CONFIG_ARM=y
-CONFIG_TARGET_VEXPRESS64_JUNO=y
-CONFIG_SYS_TEXT_BASE=0xe0000000
-CONFIG_SYS_MALLOC_LEN=0x810000
-CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_ARCH_VEXPRESS64=y
 CONFIG_NR_DRAM_BANKS=2
-CONFIG_ENV_SIZE=0x10000
-CONFIG_ENV_SECT_SIZE=0x10000
 CONFIG_DEFAULT_DEVICE_TREE="juno-r2"
 CONFIG_IDENT_STRING=" vexpress_aemv8a"
+CONFIG_TARGET_VEXPRESS64_JUNO=y
 CONFIG_SYS_MEMTEST_START=0x80000000
 CONFIG_SYS_MEMTEST_END=0xff000000
-CONFIG_DISTRO_DEFAULTS=y
 CONFIG_REMAKE_ELF=y
-CONFIG_SYS_LOAD_ADDR=0x90000000
 CONFIG_BOOTDELAY=1
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyAMA0,115200n8 root=/dev/sda2 rw rootwait earlycon=pl011,0x7ff80000 debug user_debug=31 androidboot.hardware=juno loglevel=9"
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_SYS_PROMPT="VExpress64# "
-# CONFIG_CMD_CONSOLE is not set
-# CONFIG_CMD_XIMG is not set
-# CONFIG_CMD_EDITENV is not set
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_ARMFLASH=y
-# CONFIG_CMD_LOADS is not set
 CONFIG_CMD_PCI=y
 CONFIG_CMD_SATA=y
-CONFIG_CMD_USB=y
-# CONFIG_CMD_ITEST is not set
-# CONFIG_CMD_SETEXPR is not set
 CONFIG_BOOTP_BOOTFILESIZE=y
-# CONFIG_CMD_NFS is not set
 CONFIG_CMD_CACHE=y
-# CONFIG_CMD_SLEEP is not set
 CONFIG_CMD_UBI=y
-CONFIG_ENV_IS_IN_FLASH=y
-CONFIG_ENV_ADDR=0xBFC0000
-CONFIG_SATA_SIL=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
-CONFIG_MTD_NOR_FLASH=y
-CONFIG_FLASH_CFI_DRIVER=y
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_PROTECTION=y
 CONFIG_SYS_FLASH_CFI=y
-CONFIG_SMC911X=y
-CONFIG_SMC911X_32_BIT=y
+CONFIG_DM_ETH=y
 CONFIG_PCI=y
-CONFIG_PCIE_ECAM_GENERIC=y
-CONFIG_USB_EHCI_HCD=y
-CONFIG_USB_EHCI_GENERIC=y
-CONFIG_USB_OHCI_HCD=y
-CONFIG_USB_OHCI_GENERIC=y
+CONFIG_USB=y
diff --git a/configs/vexpress_aemv8a_semi_defconfig b/configs/vexpress_aemv8a_semi_defconfig
index b36a33a..eca6176 100644
--- a/configs/vexpress_aemv8a_semi_defconfig
+++ b/configs/vexpress_aemv8a_semi_defconfig
@@ -1,51 +1,27 @@
 CONFIG_ARM=y
 # CONFIG_ARM64_CRC32 is not set
-CONFIG_TARGET_VEXPRESS64_BASE_FVP=y
-CONFIG_SYS_TEXT_BASE=0x88000000
-CONFIG_SYS_MALLOC_LEN=0x840000
-CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_ARCH_VEXPRESS64=y
 CONFIG_NR_DRAM_BANKS=2
-CONFIG_ENV_SIZE=0x40000
-CONFIG_ENV_SECT_SIZE=0x40000
+CONFIG_DEFAULT_DEVICE_TREE="fvp-base-revc"
 CONFIG_IDENT_STRING=" vexpress_aemv8a"
 CONFIG_SYS_MEMTEST_START=0x80000000
 CONFIG_SYS_MEMTEST_END=0xff000000
-CONFIG_DISTRO_DEFAULTS=y
 CONFIG_REMAKE_ELF=y
-CONFIG_SYS_LOAD_ADDR=0x90000000
 CONFIG_ANDROID_BOOT_IMAGE=y
 CONFIG_BOOTDELAY=1
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttyAMA0 earlycon=pl011,0x1c090000 debug user_debug=31 loglevel=9"
-CONFIG_BOOTCOMMAND="if smhload ${boot_name} ${boot_addr_r}; then   setenv bootargs;   abootimg addr ${boot_addr_r};   abootimg get dtb --index=0 fdt_addr_r;   bootm ${boot_addr_r} ${boot_addr_r}   ${fdt_addr_r}; else;   setenv fdt_high 0xffffffffffffffff;   setenv initrd_high 0xffffffffffffffff;   smhload ${kernel_name} ${kernel_addr_r};   smhload ${fdtfile} ${fdt_addr_r};   smhload ${ramdisk_name} ${ramdisk_addr_r}   ramdisk_end;   fdt addr ${fdt_addr_r}; fdt resize;   fdt chosen ${ramdisk_addr_r} ${ramdisk_end};   booti $kernel_addr_r - $fdt_addr_r; fi"
 # CONFIG_DISPLAY_CPUINFO is not set
-# CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_SYS_PROMPT="VExpress64# "
-# CONFIG_CMD_CONSOLE is not set
 CONFIG_CMD_ABOOTIMG=y
-# CONFIG_CMD_XIMG is not set
-# CONFIG_CMD_EDITENV is not set
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_ARMFLASH=y
-# CONFIG_CMD_LOADS is not set
-# CONFIG_CMD_ITEST is not set
-# CONFIG_CMD_SETEXPR is not set
 CONFIG_BOOTP_BOOTFILESIZE=y
-# CONFIG_CMD_NFS is not set
 CONFIG_CMD_CACHE=y
-# CONFIG_CMD_SLEEP is not set
 CONFIG_CMD_UBI=y
-# CONFIG_ISO_PARTITION is not set
-# CONFIG_EFI_PARTITION is not set
-CONFIG_ENV_IS_IN_FLASH=y
-CONFIG_ENV_ADDR=0xFFC0000
-CONFIG_DM=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
-CONFIG_MTD_NOR_FLASH=y
-CONFIG_FLASH_CFI_DRIVER=y
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_PROTECTION=y
 CONFIG_SYS_FLASH_CFI=y
-CONFIG_DM_SERIAL=y
-CONFIG_OF_LIBFDT=y
+CONFIG_VIRTIO_MMIO=y
diff --git a/configs/vexpress_aemv8r_defconfig b/configs/vexpress_aemv8r_defconfig
new file mode 100644
index 0000000..612797e
--- /dev/null
+++ b/configs/vexpress_aemv8r_defconfig
@@ -0,0 +1,14 @@
+CONFIG_ARM=y
+CONFIG_ARCH_VEXPRESS64=y
+CONFIG_NR_DRAM_BANKS=2
+CONFIG_DEFAULT_DEVICE_TREE="arm_fvp"
+CONFIG_IDENT_STRING=" vexpress_aemv8r64"
+CONFIG_TARGET_VEXPRESS64_BASER_FVP=y
+CONFIG_REMAKE_ELF=y
+CONFIG_BOOTDELAY=3
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttyAMA0 earlycon=pl011,0x9c090000 rootfstype=ext4 root=/dev/vda2 rw rootwait"
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_SYS_PROMPT="VExpress64# "
+# CONFIG_MMC is not set
+CONFIG_VIRTIO_MMIO=y