Merge "fix(rpi4): drop /memreserve/ region" into integration
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commit
19ebec9f66
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@ -201,6 +201,44 @@ void bl31_plat_arch_setup(void)
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enable_mmu_el3(0);
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}
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/*
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* Remove the FDT /memreserve/ entry that covers the region at the very
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* beginning of memory (if that exists). This is where the secondaries
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* originally spin, but we pull them out there.
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* Having overlapping /reserved-memory and /memreserve/ regions confuses
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* the Linux kernel, so we need to get rid of this one.
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*/
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static void remove_spintable_memreserve(void *dtb)
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{
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uint64_t addr, size;
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int regions = fdt_num_mem_rsv(dtb);
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int i;
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for (i = 0; i < regions; i++) {
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if (fdt_get_mem_rsv(dtb, i, &addr, &size) != 0) {
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return;
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}
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if (size == 0U) {
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return;
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}
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/* We only look for the region at the beginning of DRAM. */
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if (addr != 0U) {
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continue;
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}
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/*
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* Currently the region in the existing DTs is exactly 4K
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* in size. Should this value ever change, there is probably
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* a reason for that, so inform the user about this.
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*/
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if (size == 4096U) {
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fdt_del_mem_rsv(dtb, i);
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return;
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}
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WARN("Keeping unknown /memreserve/ region at 0, size: %lld\n",
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size);
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}
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}
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static void rpi4_prepare_dtb(void)
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{
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void *dtb = (void *)rpi4_get_dtb_address();
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@ -227,7 +265,11 @@ static void rpi4_prepare_dtb(void)
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return;
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}
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/* Reserve memory used by Trusted Firmware. */
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/*
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* Remove the original reserved region (used for the spintable), and
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* replace it with a region describing the whole of Trusted Firmware.
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*/
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remove_spintable_memreserve(dtb);
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if (fdt_add_reserved_memory(dtb, "atf@0", 0, 0x80000))
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WARN("Failed to add reserved memory nodes to DT.\n");
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