Message ID | 20241107025831.5459-2-semen.protsenko@linaro.org |
---|---|
State | New |
Headers | show
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Wed, 06 Nov 2024 18:58:33 -0800 (PST) From: Sam Protsenko <semen.protsenko@linaro.org> To: Tom Rini <trini@konsulko.com>, Ilias Apalodimas <ilias.apalodimas@linaro.org>, Heinrich Schuchardt <xypron.glpk@gmx.de> Cc: David Feng <fenghua@phytium.com.cn>, u-boot@lists.denx.de Subject: [PATCH v2 2/2] armv8: cpu: Implement allow_unaligned() Date: Wed, 6 Nov 2024 20:58:31 -0600 Message-Id: <20241107025831.5459-2-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241107025831.5459-1-semen.protsenko@linaro.org> References: <20241107025831.5459-1-semen.protsenko@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion <u-boot.lists.denx.de> List-Unsubscribe: <https://lists.denx.de/options/u-boot>, <mailto:u-boot-request@lists.denx.de?subject=unsubscribe> List-Archive: <https://lists.denx.de/pipermail/u-boot/> List-Post: <mailto:u-boot@lists.denx.de> List-Help: <mailto:u-boot-request@lists.denx.de?subject=help> List-Subscribe: <https://lists.denx.de/listinfo/u-boot>, <mailto:u-boot-request@lists.denx.de?subject=subscribe> Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" <u-boot-bounces@lists.denx.de> X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean |
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[v2,1/2] armv8: Fix get_sctlr() return type
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diff --git a/arch/arm/cpu/armv8/cpu.c b/arch/arm/cpu/armv8/cpu.c index d568efa427ab..82ecf02f4b03 100644 --- a/arch/arm/cpu/armv8/cpu.c +++ b/arch/arm/cpu/armv8/cpu.c @@ -94,3 +94,8 @@ void armv8_setup_psci(void) secure_ram_addr(psci_arch_init)(); } #endif + +void allow_unaligned(void) +{ + set_sctlr(get_sctlr() & ~CR_A); +}
Usually ARMv8 platforms allow unaligned access for Normal memory. But some chips might not allow it by default, having SCTLR.A bit set to 1 before U-Boot execution. One such example is Exynos850 SoC. As allow_unaligned() is not implemented for ARMv8 at the moment, its __weak implementation is used, which does nothing. That might lead to unaligned access abort, for example when running EFI selftest. Fix that by implementing allow_unaligned() for ARMv8. The issue was found when running EFI selftest on E850-96 board (Exynos850 based): => bootefi selftest $fdtcontroladdr ... Executing 'HII database protocols' "Synchronous Abort" handler, esr 0x96000021, far 0xbaac0991 ... resetting ... Unaligned abort happens in u16_strnlen(), which is called from efi_hii_sibt_string_ucs2_block_next(): u16_strlen(blk->string_text) where 'blk' type is struct efi_hii_sibt_string_ucs2_block. Because this struct is packed, doing "->string_text" makes 'blk' address incremented by 1 byte, which makes it unaligned. Although allow_unaligned() was called in efi_init_early() before EFI selftest execution, it wasn't implemented for ARMv8 CPUs, so data abort happened. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> --- Changes in v2: - None arch/arm/cpu/armv8/cpu.c | 5 +++++ 1 file changed, 5 insertions(+)