[PATCH v4 3/4] Kconfig: j721e: Change K3_MCU_SCRATCHPAD_BASE to non firewalled region

[Tom Rini]

On Wed, Mar 15, 2023 at 12:18:54PM +0530, Manorit Chawdhry wrote:
> On 14:01-20230306, Tom Rini wrote:
> > On Mon, Mar 06, 2023 at 11:12:53AM +0530, Manorit Chawdhry wrote:
> > > In non-combined boot flow for K3, all the firewalls are locked by default
> > > until sysfw comes up. Rom configures some of the firewall for its usage
> > > along with the SRAM for R5 but the PSRAM region is still locked.
> > > 
> > > The K3 MCU Scratchpad for j721e was set to a PSRAM region triggering the
> > > firewall exception before sysfw came up. The exception started happening
> > > after adding multi dtb support that accesses the scratchpad for reading
> > > EEPROM contents.
> > > 
> > > The commit changes R5 MCU scratchpad for j721e to an SRAM region.
> > > 
> > > Old Map:
> > > ┌─────────────────────────────────────┐ 0x41c00000
> > > │                 SPL                 │
> > > ├─────────────────────────────────────┤ 0x41c40000 (approx)
> > > │                STACK                │
> > > ├─────────────────────────────────────┤ 0x41c85b20
> > > │             Global data             │
> > > │  sizeof(struct global_data) = 0xd8  │
> > > ├─────────────────────────────────────┤ gd->malloc_base = 0x41c85bfc
> > > │                HEAP                 │
> > > │  CONFIG_SYS_MALLOC_F_LEN = 0x70000  │
> > > ├─────────────────────────────────────┤ CONFIG_SPL_BSS_START_ADDR
> > > │               SPL BSS               │ (0x41cf5bfc)
> > > │  CONFIG_SPL_BSS_MAX_SIZE = 0xA000   │
> > > └─────────────────────────────────────┘ CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX
> > > 			                (0x41cffbfc)
> > > 
> > > New Map:
> > > ┌─────────────────────────────────────┐ 0x41c00000
> > > │                 SPL                 │
> > > ├─────────────────────────────────────┤ 0x41c40000 (approx)
> > > │                EMPTY                │
> > > ├─────────────────────────────────────┤ 0x41c81920
> > > │                STACK                │
> > > │ SPL_SIZE_LIMIT_PROVIDE_STACK=0x4000 │
> > > ├─────────────────────────────────────┤ 0x41c85920
> > > │             Global data             │
> > > │  sizeof(struct global_data) = 0xd8  │
> > > ├─────────────────────────────────────┤ gd->malloc_base = 0x41c859f0
> > > │                HEAP                 │
> > > │  CONFIG_SYS_MALLOC_F_LEN = 0x70000  │
> > > ├─────────────────────────────────────┤ CONFIG_SPL_BSS_START_ADDR
> > > │               SPL BSS               │ (0x41cf59f0)
> > > │  CONFIG_SPL_BSS_MAX_SIZE = 0xA000   │
> > > ├─────────────────────────────────────┤ 0x41cff9fc
> > > │         NEW MCU SCRATCHPAD          │
> > > │  SYS_K3_MCU_SCRATCHPAD_SIZE = 0x200 │
> > > └─────────────────────────────────────┘ CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX
> > > 			                (0x41cffbfc)
> > > 
> > > Fixes: ab977c8b91b4 ("configs: j721s2_evm_r5: Enable support for building multiple dtbs into FIT")
> > > 
> > > Signed-off-by: Manorit Chawdhry <m-chawdhry at ti.com>
> > > [n-francis at ti.com: SRAM allocation addressing diagram]
> > > Signed-off-by: Neha Francis <n-francis at ti.com>
> > > Reviewed-by: Tom Rini <trini at konsulko.com>
> > > Reviewed-by: Kamlesh Gurudasani <kamlesh at ti.com>
> > > ---
> > >  arch/arm/mach-k3/Kconfig       |  3 ++-
> > >  configs/j721e_evm_r5_defconfig | 10 ++++++++--
> > >  doc/board/ti/j721e_evm.rst     | 27 +++++++++++++++++++++++++++
> > 
> > OK, but now this just renders differently poorly.  Please see the
> > list-table directive as used for example in doc/board/apple/m1.rst and
> > it would be good to get other ascii tables updated to produce nice
> > output as well.
> > 
> 
> Hi Tom,
> 
> I've updated this table in v5, we can look at updating other tables
> later.

Sounds good, thanks.

-- 
Tom
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