[PATCH v5 3/3] board: qemu-riscv: enable semihosting

[Leo Liang]

Hi Kautuk,

We have tested your patchset with QEMU 7.1.0.
It generally looks fine, but CI error seems to persist.
https://source.denx.de/u-boot/custodians/u-boot-riscv/-/pipelines/14314

The error comes from CI testcase timed-out.
The reason for the time-out is not yet confirmed, 
but we suspect it's because when executing under semihosting, 
QEMU could not exit normally. (thru ctrl+x a)

There is a seemingly relevent patchset that sits on QEMU mailing list for some time.
https://lore.kernel.org/all/20220620190834.GA16887@ws2101.lin.mbt.kalray.eu/T/#m1bc32cc32511b6ac8adfaf67983dc2bccd4b9ec9

On the u-boot side, what do you think if we disable semihosting by default?
(i.e., not adding CONFIG_SEMIHOSTING_XXX in qemu's defconfig)

Best regards,
Leo

On Tue, Dec 06, 2022 at 11:12:41AM +0530, Kautuk Consul wrote:
> Hi,
> 
> On Mon, Dec 5, 2022 at 8:46 PM Sean Anderson <sean.anderson at seco.com> wrote:
> >
> > On 12/5/22 00:51, Kautuk Consul wrote:
> > > Hi,
> > >
> > > On Sat, Dec 3, 2022 at 9:44 AM Bin Meng <bmeng.cn at gmail.com> wrote:
> > >>
> > >> On Fri, Sep 23, 2022 at 3:03 PM Kautuk Consul <kconsul at ventanamicro.com> wrote:
> > >> >
> > >> > To enable semihosting we also need to enable the following
> > >> > configs in defconfigs:
> > >> > CONFIG_SEMIHOSTING
> > >> > CONFIG_SPL_SEMIHOSTING
> > >> > CONFIG_SEMIHOSTING_SERIAL
> > >> > CONFIG_SERIAL_PROBE_ALL
> > >> > CONFIG_SPL_FS_EXT4
> > >> > CONFIG_SPL_FS_FAT
> > >>
> > >> Why should these _SPL_FS_xxx be required? If it's required by
> > >> SEMIHOSTING, could the dependency be fixed there?
> > >
> > > The build dependencies require that these options be there.
> >
> > What error do you get?
> 
> If I disable both the _SPL_FS_* config options then I get the
> following compilation error:
> common/spl/spl_semihosting.c: In function 'spl_smh_load_image':
> common/spl/spl_semihosting.c:27:32: error:
> 'CONFIG_SPL_FS_LOAD_PAYLOAD_NAME' undeclared (first use in this
> function)
>    27 |         const char *filename = CONFIG_SPL_FS_LOAD_PAYLOAD_NAME;
>       |                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> common/spl/spl_semihosting.c:27:32: note: each undeclared identifier
> is reported only once for each function it appears in
> 
> Bin/Sean: This error is not really related to the semihosting feature
> but is related to COFIG_SPL in general.
> Can you please accept this patch-set and then I'll try and find time
> in the future maybe to rectify this build dependency
> problem ?
> 
> >
> > --Sean
> >
> > >>
> > >> >
> > >> > Signed-off-by: Kautuk Consul <kconsul at ventanamicro.com>
> > >> > ---
> > >> >  configs/qemu-riscv32_defconfig       | 4 ++++
> > >> >  configs/qemu-riscv32_smode_defconfig | 4 ++++
> > >> >  configs/qemu-riscv32_spl_defconfig   | 7 +++++++
> > >> >  configs/qemu-riscv64_defconfig       | 4 ++++
> > >> >  configs/qemu-riscv64_smode_defconfig | 4 ++++
> > >> >  configs/qemu-riscv64_spl_defconfig   | 7 +++++++
> > >> >  6 files changed, 30 insertions(+)
> > >> >
> > >>
> > >> Regards,
> > >> Bin
> >