May 2021 - U-Boot

FEC_MXC_SHARE_MDIO on i.MX6ULL
by Oleh Kravchenko 02 May '21

02 May '21

Hi all, I'm working on adding u-boot support for boards based on i.MX6ULL SoC. One board has a shared MDIO (CONFIG_FEC_MXC_SHARE_MDIO=y). > U-Boot 2021.04-00002-gb199ac910c-dirty (May 02 2021 - 01:03:13 +0300) I've found a weird race condition in phy_find_by_mask() function. During the cold boot, it's don't initialize properly: > Net: > Warning: ethernet@20b4000 (eth1) using random MAC address - 9e:55:17:69:4a:cb > eth1: ethernet@20b4000Get shared mii bus on ethernet@2188000 > Could not get PHY for FEC1: addr 0 Everything initializes properly If I perform hot boot: > Net: > Warning: ethernet@20b4000 (eth1) using random MAC address - f6:cc:65:df:9d:99 > eth1: ethernet@20b4000Get shared mii bus on ethernet@2188000 > > Warning: ethernet@2188000 (eth0) using random MAC address - 16:1b:89:80:44:8e > , eth0: ethernet@2188000 After some debugging, I've change phy_find_by_mask(): diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 89e3076bfd..5dfc8cba37 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -914,12 +914,11 @@ struct phy_device *phy_find_by_mask(struct mii_dev *bus, uint phy_mask, phy_interface_t interface) { /* Reset the bus */ - if (bus->reset) { + if (bus->reset) bus->reset(bus); - /* Wait 15ms to make sure the PHY has come out of hard reset */ - mdelay(15); - } + /* Wait 15ms to make sure the PHY has come out of hard reset */ + mdelay(15); return get_phy_device_by_mask(bus, phy_mask, interface); } Any ideas on how to fix this issue properly? Or patch above is good enough to be merged into the u-boot source tree? -- Best regards, Oleh Kravchenko

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dfu-util capability
by ubootmaillist＠burrellhome.com 01 May '21

01 May '21

I have a system that has a CPU running u-boot and have a Xilinx Zynq connected via USB using DFU to download the FPGA image. I can successfully download the FPGA image via dfu-util from the linux OS. I would like to be able to load that same image from u-boot prior to loading the OS. From what I can tell, the DFU capability in u-boot is a host stack that sits on the USB subsystem and acts a host for a memory style device that may or may not have a filesystem. This is not quite what I need. What I want to do is take a file from a device that has a filesystem (mmc for example) and provide a DFU transfer to the DFU capable host on the FPGA. Think of it as porting dfu-util to u-boot. Is there a way of doing this in the current u-boot state or will I need to write a new command to do this? Has someone already done this? Doing serveral web searches, I am not sure that it has this capability or if it does, how to configure it correctly. Thanks in advance for the help. Paul

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[RFC PATCH v7 0/2] riscv: cpu: Add callback to init each core
by Green Wan 01 May '21

01 May '21

Add a callback interface, harts_early_init() to perform proprietary or customized CRSs configuration for each hart. harts_early_init() is placed after stack of harts are initialized and before main boot hart is picked up. Several conditions should be aware of or avoided are listed: - cannot access gd At the moment, gd hasn't initialized yet. - all operations in harts_early_init() should only affect core itself For example, the operations for board level should be moved to mach_xxx() or board_init_xxx() functions instead. - Common resource need protection if multicore Since all harts might enter harts_early_init() in parallel, common resource need a mechanism to handle race condition. - A reference implementation is added in ./arch/riscv/cpu/cpu.c The implementation is declared with '__weak' and can be overridden. Changelogs: v7 - remove M-mode check in [v6 1/2] - remove 'arch' from title of patch - add Reviewed-by v6 - revised the description in both of commit message and comment [1/2] - moved the implementation of harts_early_init() in [2/2] from board/sifive/unmatched/spl.c to arch/riscv/cpu/fu740/spl.c. and revised commit message v5 - rename riscv_hart_early_init to harts_early_init - rephrase dummy for harts_early_init() to callback but keep current comments not specific for customizing CSRs only. - Fix nit in [2/2] and add reviewed-by v4 - Revising the comments for riscv_hart_early_init() in [1/2] - Remove unnecessary braces and add reviewed-by in [2/2] Green Wan (2): riscv: cpu: Add callback to init each core riscv: cpu: fu740: clear feature disable CSR arch/riscv/cpu/cpu.c | 11 +++++++++++ arch/riscv/cpu/fu740/spl.c | 15 +++++++++++++++ arch/riscv/cpu/start.S | 6 ++++++ 3 files changed, 32 insertions(+) -- 2.31.0

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