Currently, this local RAM is not accessible from the CPU.
If the CPU tries to access it, then the CPU will hang.
Remoteproc may try to use it when it load a firmware
that has some sections in the local RAM.
This workarounds the issue by skiping this section.
Signed-off-by: Alexandre Bailon <abailon@xxxxxxxxxxxx>
---
drivers/remoteproc/mtk_apu_rproc.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/remoteproc/mtk_apu_rproc.c b/drivers/remoteproc/mtk_apu_rproc.c
index 565b3adca5de..e16d3258a785 100644
--- a/drivers/remoteproc/mtk_apu_rproc.c
+++ b/drivers/remoteproc/mtk_apu_rproc.c
@@ -57,6 +57,9 @@
#define CORE_DEFAULT2_SPIDEN BIT(0)
#define CORE_XTENSA_ALTRESETVEC (0x000001F8)
+#define DRAM0_START (0x7ff00000)
+#define IRAM0_END (0x7ff80000)
+
struct mtk_vpu_rproc {
struct device *dev;
struct rproc *rproc;
@@ -139,6 +142,7 @@ static void mtk_vpu_rproc_kick(struct rproc *rproc, int vqid)
int mtk_vpu_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
{
+ struct mtk_vpu_rproc *vpu_rproc = rproc->priv;
const u8 *elf_data = fw->data;
struct elf32_hdr *ehdr;
struct elf32_phdr *phdr;
@@ -156,6 +160,16 @@ int mtk_vpu_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
/* Remove empty PT_LOAD section */
if (phdr->p_type == PT_LOAD && !phdr->p_paddr)
phdr->p_type = PT_NULL;
+ /*
+ * Workaround: Currently, the CPU can't access to the APU
+ * local RAM. This removes the local RAM section from the
+ * firmware. Please note that may cause some issues.
+ */
+ if (phdr->p_paddr >= DRAM0_START && phdr->p_paddr < IRAM0_END) {
+ dev_warn_once(vpu_rproc->dev,
+ "Skipping the APU local RAM section\n");
+ phdr->p_type = PT_NULL;
+ }
}
return 0;
--
2.26.2
