Hi Simon,
On 6.9.2016 16:23, Simon Glass wrote:
Hi Michal,
On 6 September 2016 at 07:40, Michal Simek michal.simek@xilinx.com wrote:
Hi,
On 6.9.2016 14:57, Simon Glass wrote:
Hi Alex,
On 6 September 2016 at 06:55, Alexander Graf agraf@suse.de wrote:
On 09/06/2016 02:52 PM, Simon Glass wrote:
Hi Alex,
On 6 September 2016 at 03:09, Alexander Graf agraf@suse.de wrote:
On 09/06/2016 03:05 AM, Simon Glass wrote: > > Hi Alex, > > On 5 September 2016 at 04:51, Alexander Graf agraf@suse.de wrote: >> >> On 08/19/2016 08:45 AM, Michal Simek wrote: >>> >>> On 16.8.2016 20:39, Alexander Graf wrote: >>>> >>>> Hi Michal, >>>> >>>> I just tried to run the latest u-boot master + a few patches to >>>> implement >>>> generic PSCI RTS support on zynqmp and got this: >>>> >>>> e >>>> U-Boot 2016.09-rc1-00453-ga0592f1 (Aug 16 2016 - 20:27:40 +0200) >>>> Xilinx >>>> ZynqMP ZCU102 >>>> >>>> I2C: ready >>>> DRAM: 4 GiB >>>> EL Level: EL2 >>>> MMC: sdhci@ff170000: 0 >>>> Using default environment >>>> >>>> In: serial@ff000000 >>>> Out: serial@ff000000 >>>> Err: serial@ff000000 >>>> Bootmode: SD_MODE1 >>>> SCSI: SATA link 0 timeout. >>>> Target spinup took 0 ms. >>>> AHCI 0001.0301 32 slots 2 ports 6 Gbps 0x3 impl SATA mode >>>> flags: 64bit ncq pm clo only pmp fbss pio slum part ccc apst >>>> scanning bus for devices... >>>> "Synchronous Abort" handler, esr 0x96000004 >>>> ELR: 7ff42d20 >>>> LR: 7ff3ff10 >>>> x0 : 0000000000000000 x1 : 0000000000000000 >>>> x2 : 0000000000000001 x3 : 000000007df1aa80 >>>> x4 : aaaaaaaaaaaaaaaa x5 : 0000000000000001 >>>> x6 : 0000000000000200 x7 : 0000000000000004 >>>> x8 : 000000007ff9f800 x9 : 0000000000000008 >>>> x10: 000000007ff9f8f0 x11: 0000000000000000 >>>> x12: 00000000ffffffff x13: 00000000ffffffff >>>> x14: 000000007ff8242f x15: 000000007ff82435 >>>> x16: 000000007ff84388 x17: 000000007ff84388 >>>> x18: 000000007df1ade8 x19: 000000007df1aa80 >>>> x20: 000000007ff92cb8 x21: 000000007ff9f800 >>>> x22: 000000007ff9f000 x23: 0000000000000078 >>>> x24: 000000007ff9f8f0 x25: 0000000000000000 >>>> x26: 000000007ff9f800 x27: 000000007ff9f000 >>>> x28: 000000007ff9fb00 x29: 000000007df1aca0 >>>> >>>> Resetting CPU ... >>>> >>>> resetting … >>>> >>>> Is this a known problem? >>> >>> Is this issue with usb? >>> I have usb off on zcu102 that's why if this usb issue >>> I am not aware about it. >> >> >> After a bit of digging, turns out it's CONFIG_BLK. If I disable that >> things >> work again (albeit without mmc access, since that one requires >> CONFIG_BLK >> now). > > I don't have a zynqmp device, so cannot test with that unfortunately.
Well, QEMU supports zcu102 emulation in the latest version, so you could use that to emulate the board:
$ qemu-system-aarch64 -M xlnx-zcu102 -kernel u-boot.elf -nographic -m 2G -drive file=u-boot,id=d,if=none -device ide-drive,drive=d,bus=ide.0
However, I don't see the data abort with the emulated device, only with actual hardware. Probably because real hardware is more upset about reading from address 0 ;). But I can provoke the oops even in QEMU if I unmap the first page from the memory map using the patch below.
The oops happens in blk_dread because block_dev->bdev is NULL.
Yes, this field really should be removed. As the comment says it's a hangover from pre-CONFIG_BLK where functions use a struct blk_dev * to specify the block device instead of a struct udevice *. It came up recently on a patch you sent also which is why I am so against using it.
That said, I'm not sure why it is unset. The path should be:
sdhci_bind() mmc_bind() blk_create_devicef() blk_create_device() which sets:
desc->bdev = dev;
[snip]
The special case about ZynqMP is that it has 2 storage backends, one that uses DM (the sdhc controller) and one that isn't converted to DM (the AHCI controller). I guess something goes wrong with the latter.
OK, well it would be good to convert it. It certainly won't work without it and I'm a little surprised that it compiles :-)
probably good time to convert it. Driver itself has only sata init sequence and then it is just compatible with ahci. That's why conversion should be pretty easy.
Simon: Which driver should I use as inspiration for conversion?
I looked at sata a while back, so here are a few ideas...
Existing sata.h functions should be #ifdef'd out
- init_sata() should be handled by the driver probe() method
- hopefully sata_stop() can be handled by driver remove() method
- the block device can handle read and write
- we probably need sata methods for scan and reset
There is also ahci.h.
There is a sata_sandbox.c driver which you could convert to DM, perhaps with a new DM_SATA option (like DM_MMC).
I have sent RFC for moving ceva driver to DM with some core changes. There will be probably a need to test it on platform which is capable to connect more HDDs to make sure that everything is correct.
Thanks, Michal