[U-Boot] [RESEND][PATCH 00/24] sh: add generic board support and fixes

Tue Nov 29 02:22:03 CET 2016

On Tue, Nov 29, 2016 at 02:58:41AM +0200, Vladimir Zapolskiy wrote:
> Hi Tom,
> 
> On 11/28/2016 05:43 PM, Tom Rini wrote:
> > On Mon, Nov 28, 2016 at 12:15:12AM +0200, Vladimir Zapolskiy wrote:
> > 
> >> This is a combined series of the fixes to SH2/SH3/SH4/SH4A architecture port
> >> of U-boot on top of the master branch, there is no functional difference
> >> between this series and 3 my series sent in August 2016 for 2016.09, however
> >> due to many positive generalization updates to U-boot sources the old
> >> unreviewed series can not be cleanly applied anymore:
> >>
> >> * [PATCH 0/6] sh4: fix and simplify cache manipulation
> >> * [PATCH 0/5] sh4: fixes to SH7751 PCI host controller
> >> * [PATCH] common: sh: add necessary define bits to board_f
> >> * [PATCH 00/12] sh: change arch and boards code to generic board
> >>
> >> I have to resend the changes, because apparently Nobuhiro Iwamatsu is
> >> too busy to maintain SH port and I ask Tom/Simon/Marek and other active
> >> U-boot developers to review and apply the changes, it is highly desirable
> >> to have a possibility to run modern U-boot on boards powered by SH cores.
> > 
> > First, would you be interested in taking up the SH maintainership?
> 
> clearly Renesas abandoned SH architecture as a legacy one (and probably
> as a competing with R-Car one), but until J4 core as a replacement for
> Renesas SH4 is released by j-core.org project it is desirable to keep
> U-Boot running on SH platforms.
> 
> I'm interested in maintainership of SH and thereafter J-Core cores, but
> practically I have only one SH4 powered board on hand, unfortunately
> begging for hardware donations was not so successful. At the moment
> U-Boot contains SH2A/SH3/SH4/SH4A arch support and boards, I have to
> figure out where to get more boards to cover more SoC flavours, and
> getting legacy hardware is always a problem, because it is not on
> a store's shelf.
> 
> To start from I would recommend to decouple u-boot-sh.git fork into
> independent SH and ARM R-Car repositories, the latter one will be
> maintained by Renesas associates.

I'm interesting in having J-Core work and be maintained in U-Boot, so
lets make this work.  With regards to legacy platforms, I'm happy to
drop things which are unavailable / non-functional and just note in
doc/README.scrapyard when things were removed.  We did this a lot around
a year ago and probably should again.

And then yes, the R-Car patches should come in via another repository
rather than u-boot.sh as was previously convenient.

> > Second, I know before you told me how to get QEMU to run, but with this
> > series and:
> > qemu-system-sh4 -M r2d -kernel r2dplus/current/r2dplus/u-boot.bin
> > -nographic -serial null -serial vc
> > 
> > I get:
> > QEMU 2.5.91 monitor - type 'help' for more information
> > (qemu) long write to SH7750_WCR1_A7 (0x000000001f800008) ignored
> > long write to SH7750_WCR2_A7 (0x000000001f80000c) ignored
> > long write to SH7750_WCR3_A7 (0x000000001f800010) ignored
> > long write to SH7750_MCR_A7 (0x000000001f800014) ignored
> > word write to SH7750_RTCNT_A7 (0x000000001f800020) ignored
> > word write to SH7750_RTCOR_A7 (0x000000001f800024) ignored
> > Write access to refresh count register
> > word write to SH7750_RTCSR_A7 (0x000000001f80001c) ignored
> > Read access to refresh count register, incrementing
> > long write to SH7750_MCR_A7 (0x000000001f800014) ignored
> > long read to SH7750_WCR1_A7 (0x000000001f800008) ignored
> > long read to SH7750_WCR2_A7 (0x000000001f80000c) ignored
> > long read to SH7750_WCR3_A7 (0x000000001f800010) ignored
> > long read to SH7750_MCR_A7 (0x000000001f800014) ignored
> > 
> > and the qemu monitor/debug prompt.
> 
> The displayed qemu output is expected and can be ignored, currently SH
> port in qemu is in "odd fixes" maintainership stage, hopefully I'll
> find time to send a patch to silence this.

Ah, OK.

> > Without -serial args I just get the
> > hang.  Any ideas?  I ask since I'm keen to add r2dplus to test.py and
> > travis-ci once it's working, thanks!
> > 
> 
> I use this list of components to build and test U-Boot on r2dplus
> qemu target and SH7751 powered board I have on hand (it is quite
> similar to r2dplus devkit):
> 
> * SH4 toolchain from buildroot distro with musl (libc flavour most
>   probably is unrelated to U-boot or kernel):
>  - gcc-5.3.0
>  - musl-1.1.12
>  - linux-4.4 headers
> 
> * qemu-system-sh4 is from standard Debian qemu-system-misc package:
>  - qemu-system-misc-1:2.6+dfsg-3
>  - qemu-2.6.50 vanilla build also works for me fine
> 
> * U-Boot compilation:
> 
> % make ARCH=sh CROSS_COMPILE=sh4-buildroot-linux-musl-
> CC='sh4-buildroot-linux-musl-gcc -Wall' r2dplus_defconfig
> 
> % make ARCH=sh CROSS_COMPILE=sh4-buildroot-linux-musl-
> CC='sh4-buildroot-linux-musl-gcc -Wall' u-boot.bin
> 
> Command to run qemu with output directly to a console is similar to
> the command you mentioned above (press Ctrl-C to terminate):
> 
> % qemu-system-sh4 -M r2d -kernel u-boot.bin -monitor null -serial null
> -serial stdio -nographic
> 
> This is an example of testing on my end (omitting "long write ..
> ignored" messages):
> 
> U-Boot 2016.11-00195-ge01f392eab43 (Nov 29 2016 - 02:55:25 +0200)
> 
> CPU: SH4
> BOARD: Renesas Solutions R2D Plus
> DRAM:  64 MiB
> Flash: ERROR: too many flash sectors
> 8 MiB
> *** Warning - bad CRC, using default environment
> 
> PCI: SH7751 PCI host bridge found.
> long read to SH7750_WCR1_A7 (0x000000001f800008) ignored
> long read to SH7750_WCR2_A7 (0x000000001f80000c) ignored
> long read to SH7750_WCR3_A7 (0x000000001f800010) ignored
> long read to SH7750_MCR_A7 (0x000000001f800014) ignored
> PCI:   Bus Dev VenId DevId Class Int
> PCI:
>   00:00.0     - 1054:350e - Bridge device
>   00:02.0     - 10ec:8139 - Network controller
> In:    serial
> Out:   serial
> Err:   serial
> Net:   RTL8139#0
> Error: RTL8139#0 address not set.
> 
> IDE:   Bus 0: not available
> => bdinfo
> mem start      = 0x8C000000
> mem size       = 0x04000000
> flash start    = 0xA0000000
> flash size     = 0x00800000
> flash offset   = 0xFFE5D444
> ethaddr     = (not set)
> IP addr     = <NULL>
> baudrate    = 115200 bps
> => pci
> Scanning PCI devices on bus 0
> BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
> _____________________________________________________________
> 00.00.00   0x1054     0x350e     Bridge device           0x00
> 00.02.00   0x10ec     0x8139     Network controller      0x00

Ah, OK.  With that exact command line I can get things going.  My gut
feeling, having played with other qemu boards as a user, is that there's
something odd going on in how qemu is parsing the arguments and
assigning things as the defaults "should" provide this too, but instead
we're disabling the defaults for monitor and serial (which can usually
be multiplexed) and then only giving serial to stdio.

But, the good news is that this means I can get travis-ci going and make
add r2dplus to the list of tested-every-time platforms.  I'll follow up
to your series with patches for that hopefully tomorrow.

-- 
Tom
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