Some mPCIe cards are broken and their PIN 43 incorrectly that card is mSATA. U-Boot SPL on Turris Omnia is using PIN 43 for configuring PCIe vs SATA functionality on SerDes. Allow to configure functionality via additional env variable "omnia_msata_slot" which may override PIN 43.
To force PCIe mode for broken MiniPCIe cards, call U-Boot commands:
=> setenv omnia_msata_slot pcie => saveenv => reset
PCI-SIG in PCIe Mini CEM 2.1 spec added support for USB3.0 mode to mPCIe cards. PCIe and USB3.0 functions share same pins (like SATA pins on mSATA with PCIe on mPCIe) and therefore only one function may be active at the same time. This mode was introduced by PCI-SIG specially for LTE/5G modems.
One mPCIe slot on Turris Omnia is connected to A385 CPU SerDes which can be configured for PCIe or USB3.0 function. It is the slot with SIM card suitable for cellular modems. As PCIe Mini CEM 2.1 spec say that detection of PCIe vs USB3.0 functionality is platform specific, add a new U-Boot variable "omnia_wwan_slot" for configuring functionality in this slot. By default PCIe is used like before.
To set this WWAN slot to USB3.0 mode, call U-Boot commands:
=> setenv omnia_wwan_slot usb3 => saveenv => reset
Pali Rohár (8): env: sf: Allow to use env_sf_init_addr() at any stage arm: mvebu: turris_omnia: Provide env_sf_get_env_addr() function arm: mvebu: turris_omnia: Enable ENV support in SPL arm: mvebu: turris_omnia: Define only one serdes map variable arm: mvebu: turris_omnia: Allow to configure mSATA slot via env variable arm: mvebu: turris_omnia: Extract code for disabling sata/pcie arm: mvebu: turris_omnia: Signal error when sata/pcie DT mode arm: mvebu: turris_omnia: Add support for USB3.0 mode in WWAN MiniPCIe slot
board/CZ.NIC/turris_omnia/turris_omnia.c | 207 +++++++++++++++++------ configs/turris_omnia_defconfig | 1 + env/sf.c | 22 +-- 3 files changed, 163 insertions(+), 67 deletions(-)