Re: [Qemu-devel] [Qemu-riscv] [PATCH] riscv: sifive_e: Correct various SoC IP block sizes

[Bin Meng]

On Wed, Aug 7, 2019 at 5:06 AM Philippe Mathieu-Daudé <address@hidden> wrote:
>
> On 8/5/19 8:43 AM, Bin Meng wrote:
> > On Mon, Aug 5, 2019 at 2:14 PM Chih-Min Chao <address@hidden> wrote:
> >> On Sat, Aug 3, 2019 at 8:27 AM Bin Meng <address@hidden> wrote:
> >>>
> >>> Some of the SoC IP block sizes are wrong. Correct them according
> >>> to the FE310 manual.
> >>>
> >>> Signed-off-by: Bin Meng <address@hidden>
> >>> ---
> >>>
> >>>  hw/riscv/sifive_e.c | 6 +++---
> >>>  1 file changed, 3 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/hw/riscv/sifive_e.c b/hw/riscv/sifive_e.c
> >>> index 2a499d8..9655847 100644
> >>> --- a/hw/riscv/sifive_e.c
> >>> +++ b/hw/riscv/sifive_e.c
> >>> @@ -53,13 +53,13 @@ static const struct MemmapEntry {
> >>>      hwaddr base;
> >>>      hwaddr size;
> >>>  } sifive_e_memmap[] = {
> >>> -    [SIFIVE_E_DEBUG] =    {        0x0,      0x100 },
> >>> +    [SIFIVE_E_DEBUG] =    {        0x0,     0x1000 },
> >>>      [SIFIVE_E_MROM] =     {     0x1000,     0x2000 },
> >>>      [SIFIVE_E_OTP] =      {    0x20000,     0x2000 },
> >>>      [SIFIVE_E_CLINT] =    {  0x2000000,    0x10000 },
> >>>      [SIFIVE_E_PLIC] =     {  0xc000000,  0x4000000 },
> >>> -    [SIFIVE_E_AON] =      { 0x10000000,     0x8000 },
> >>> -    [SIFIVE_E_PRCI] =     { 0x10008000,     0x8000 },
> >>> +    [SIFIVE_E_AON] =      { 0x10000000,     0x1000 },
> >>> +    [SIFIVE_E_PRCI] =     { 0x10008000,     0x1000 },
> >>>      [SIFIVE_E_OTP_CTRL] = { 0x10010000,     0x1000 },
> >>>      [SIFIVE_E_GPIO0] =    { 0x10012000,     0x1000 },
> >>>      [SIFIVE_E_UART0] =    { 0x10013000,     0x1000 },
> >>> --
> >>> 2.7.4
> >>>
> >>
> >> It seems the modification follows  E310-G002(Hifive1 Rev B) spec and the 
> >> origin is for E310-G000(Hifive1) spec.
> >> There should be some way to specify different board version with different 
> >> memory map or we have policy, always support the latest spec.
>
> I agree with Chao, it would be cleaner to have two different boards
> (machines).
> Since the SoCs are very similar, you could add a 'revision' property and
> use it to select the correct map.
>
> >>
> >
> > Yes, I checked both specs. The older spec says these bigger sizes,
> > however their register sizes fit well in the smaller range as well. So
> > I think the modification works well for both.
>
> This is OK for the PRCI, since sifive_prci_create() does not use
> memmap[SIFIVE_E_PRCI].size.
>
> However the AON case is borderline, since you shrink it from 32KiB to 4KiB.
>
> BTW (not related to this patch) it is odd a function named
> sifive_mmio_emulate() creates a RAM region with memory_region_init_ram()
> and does not use the UnimplementedDevice (see make_unimp_dev() in
> hw/arm/musca.c).

Yes, this sifive_mmio_emulate() issue has been pointed out by Alistair
when reviewing the following patch:
http://patchwork.ozlabs.org/patch/1142293/

Regards,
Bin