Date: Mon, 12 Oct 2020 11:19:50 -0700 From: Mark Millard <marklmi@yahoo.com> To: Kyle Evans <kevans@FreeBSD.org>, freebsd-arm <freebsd-arm@freebsd.org> Subject: RPi4B: an example of what RAM u-boot reserves during operation (not necessarily matching what it reports to the next stage) vs. armstub8-gic.bin Message-ID: <A0293335-6DE2-452F-B179-0CCAFE5076BB@yahoo.com> References: <A0293335-6DE2-452F-B179-0CCAFE5076BB.ref@yahoo.com>
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U-Boot> bdinfo
boot_params =3D 0x0000000000000100
. . .
lmb_dump_all:
memory.cnt =3D 0x2
memory.size =3D 0x0
memory.reg[0x0].base =3D 0x0
.size =3D 0x3e000000
memory.reg[0x1].base =3D 0x40000000
.size =3D 0xbc000000
reserved.cnt =3D 0x2
reserved.size =3D 0x0
reserved.reg[0x0].base =3D 0x0
.size =3D 0x1000
reserved.reg[0x1].base =3D 0x3db47b30
.size =3D 0x4b84d0
. . .
That:
reserved.reg[0x0].base =3D 0x0
.size =3D 0x1000
means that armstub8-gic.bin is not fully
protected at this point in u-boot's execution.
Basically boot_fdt_add_mem_rsv_regions is all that
is used currently and it does not take into account
CONFIG_RPI_EFI_NR_SPIN_PAGES=3D2 :
/**
* boot_fdt_add_mem_rsv_regions - Mark the memreserve and =
reserved-memory
* sections as unusable
* @lmb: pointer to lmb handle, will be used for memory mgmt
* @fdt_blob: pointer to fdt blob base address
*
* Adds the and reserved-memorymemreserve regions in the dtb to the lmb =
block.
* Adding the memreserve regions prevents u-boot from using them to =
store the
* initrd or the fdt blob.
*/
void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
{
uint64_t addr, size;
int i, total, ret;
int nodeoffset, subnode;
struct fdt_resource res;
if (fdt_check_header(fdt_blob) !=3D 0)
return;
/* process memreserve sections */
total =3D fdt_num_mem_rsv(fdt_blob);
for (i =3D 0; i < total; i++) {
if (fdt_get_mem_rsv(fdt_blob, i, &addr, &size) !=3D 0)
continue;
boot_fdt_reserve_region(lmb, addr, size);
}
/* process reserved-memory */
nodeoffset =3D fdt_subnode_offset(fdt_blob, 0, =
"reserved-memory");
if (nodeoffset >=3D 0) {
subnode =3D fdt_first_subnode(fdt_blob, nodeoffset);
while (subnode >=3D 0) {
/* check if this subnode has a reg property */
ret =3D fdt_get_resource(fdt_blob, subnode, =
"reg", 0,
&res);
if (!ret && fdtdec_get_is_enabled(fdt_blob, =
subnode)) {
addr =3D res.start;
size =3D res.end - res.start + 1;
boot_fdt_reserve_region(lmb, addr, =
size);
}
subnode =3D fdt_next_subnode(fdt_blob, subnode);
}
}
}
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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