Hi,
The Juno port in U-Boot didn't see much love lately, so it has fallen a bit behind. We already get a build warning for using an old network driver, but there is more: - The port is using hardcoded information, even though we have quite decent DTs available to find things at runtime. - There is no support for USB or PCI, which pretty much limits the board to load a kernel from flash (yuck!) or TFTP (at least!). - Probably because of this, newer features like UEFI support don't work properly. - There are minor things like less-than-ideal default load addresses and missing reset support.
This series is the first part of fixing this. The main part is to switch the board port to use OF_CONTROL, so U-Boot will use a DT to configure itself at runtime. This requires some update to the PL011 driver first (patch 2/7), and allows us to simply enable USB in the defconfig (patch 6/7). USB requires two "usb reset" calls after the initial "usb start" to recognise any devices, not sure why this is. But eventually I am able to load grub from a USB hard drive and do a full featured Ubuntu UEFI boot from there (with a distro kernel).
Patches 1, 3, and 7 are mere fixes, patch 4/7 does the actual OF_CONTROL conversion.
I also have some proper DM_PCI compliant driver in an advanced state, which allows to load from a SATA hard disk. Unfortunately there is no sky2 network driver in U-Boot, so the Gigabit Ethernet chip connected to PCI will not work easily. I will post this once this is cleaned up and tested.
Converting the smc network driver to DM_ETH is on my list as well, but the code is shared with some U-Boot *application* code, also used by some PowerPC boards, so that's not really a low hanging fruit. But it would remove the deprecation warning.
Cheers, Andre
P.S. In case you want to test this without flashing it, you can chainload U-Boot from an existing U-Boot installation: $ mkimage -A arm64 -O u-boot -T standalone -C none -a 0xe0000000 -e 0xe0000000 -d u-boot.bin -n U-Boot /srv/tftp/u-boot-juno.img VExpress64# tftpboot 0xe0000000 u-boot-juno.img VExpress64# bootm 0xe0000000
Andre Przywara (7): arm: juno: Fix Juno address variables uart: pl011: Add proper DM clock support arm: juno: Fix UART clock rate arm: juno: Enable OF_CONTROL arm: juno: Use PSCI based reset arm: juno: enable USB arm: vexpress64: Remove unneeded CONFIG_ check
arch/arm/Kconfig | 11 ++++++ board/armltd/vexpress64/Kconfig | 7 ++++ board/armltd/vexpress64/vexpress64.c | 61 ++++++++++++++++++++++++++++++++-- configs/vexpress_aemv8a_juno_defconfig | 9 +++-- drivers/serial/serial_pl01x.c | 10 +++++- include/configs/vexpress_aemv8a.h | 35 ++++++++++--------- 6 files changed, 108 insertions(+), 25 deletions(-)