For bosses to reassure, the use of haisi 3519 v101, two piece of 4 gb of memory, and external memory-CodePudding

Physical address mapping, I write on the address 0 xe4276000 don't crash,

~ # cat/proc/media - mem
+ - ZONE: PHYS (0 xc0000000, 0 xffefffff), GFP=0, nBYTES=1047552 KB, NAME="ddr1
"| - MMB: phys (0 xc0000000, 0 xd5c5efff), kvirt=0 x (null), flags=0 x00000000, length=356732 KB, name="VbPool
"Xd5c5f000 | - MMB: phys (0, 0 xd5c5ffff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xd5c60000 | - MMB: phys (0, 0 xd8d49fff), kvirt=0 x (null), flags=0 x00000000, length=50088 KB, name="VbPool
"Xd8d4a000 | - MMB: phys (0, 0 xd8d4afff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xd8d4b000 | - MMB: phys (0, 0 xd9554fff), kvirt=0 x (null), flags=0 x00000000, length=8232 KB, name="VbPool
"Xd9555000 | - MMB: phys (0, 0 xd9555fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xd9556000 | - MMB: phys (0, 0 xdd199fff), kvirt=0 x (null), flags=0 x00000000, length=61712 KB, name="VbPool
"Xdd19a000 | - MMB: phys (0, 0 xdd19afff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xdd19b000 | - MMB: phys (0, 0 xe4274fff), kvirt=0 x (null), flags=0 x00000000, length=115560 KB, name="VbPool
"Xe4275000 | - MMB: phys (0, 0 xe4275fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xe4276000 | - MMB: phys (0, 0 xe5eacfff), kvirt=0 x (null), flags=0 x00000000, length=28892 KB, name="UserPool
"Xe5ead000 | - MMB: phys (0, 0 xe5eadfff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"+ - ZONE: PHYS (XBFFFFFFF x89400000 0, 0), GFP=0, nBYTES=897024 KB, NAME="anonymous"
X89400000 | - MMB: phys (0, 0 x89408fff), kvirt=0 x (null), flags=0 x00000000, length=36 KB, name="sys_scale_coef
"X89409000 | - MMB: phys (0, 0 x89418fff), kvirt=0 x (null), flags=0 x00000000, length=64 KB, name="TDE_MEMPOOL_MMB
"X89419000 | - MMB: phys (0, 0 x89419fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="u32LensMapPhyAd
"X8941a000 | - MMB: phys (0, 0 x8945afff), kvirt=0 x (null), flags=0 x00000000, length=260 KB, name="FISHEYE_NodeBuf
"X8945b000 | - MMB: phys (0, 0 x89490fff), kvirt=0 x (null), flags=0 x00000000, length=216 KB, name="VGS_NodeBuf
"X89491000 | - MMB: phys (0, 0 x89495fff), kvirt=0 x (null), flags=0 x00000000, length=20 KB, name="ACM LUTS
"X89496000 | - MMB: phys (0, 0 x89499fff), kvirt=0 x (null), flags=0 x00000000, length=16 KB, name="ACM Coef
"X8949a000 | - MMB: phys (0, 0 x8949efff), kvirt=0 x (null), flags=0 x00000000, length=20 KB, name="ACM LUTS
"X8949f000 | - MMB: phys (0, 0 x894a2fff), kvirt=0 x (null), flags=0 x00000000, length=16 KB, name="ACM Coef
"X894a3000 | - MMB: phys (0, 0 x8b446fff), kvirt=0 x (null), flags=0 x00000000, length=32400 KB, name="hifb_layer0
"X8b447000 | - MMB: phys (0, 0 x8b453fff), kvirt=0 x (null), flags=0 x00000000, length=52 KB, name="higo_log
"X8b454000 | - MMB: phys (0, 0 x8b488fff), kvirt=0 x (null), flags=0 x00000000, length=212 KB, name="IVE_QUEUE
"X8b489000 | - MMB: phys (0, 0 x8b489fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="IVE_TEMP_NODE
"X8b48a000 | - MMB: phys (0, 0 xa10e8fff), kvirt=0 x (null), flags=0 x00000000, length=356732 KB, name="VbPool
"Xa10e9000 | - MMB: phys (0, 0 xa10e9fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xa10ea000 | - MMB: phys (0, 0 xa41d3fff), kvirt=0 x (null), flags=0 x00000000, length=50088 KB, name="VbPool
"Xa41d4000 | - MMB: phys (0, 0 xa41d4fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xa41d5000 | - MMB: phys (0, 0 xa49defff), kvirt=0 x (null), flags=0 x00000000, length=8232 KB, name="VbPool
"Xa49df000 | - MMB: phys (0, 0 xa49dffff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xa49e0000 | - MMB: phys (0, 0 xa8623fff), kvirt=0 x (null), flags=0 x00000000, length=61712 KB, name="VbPool
"Xa8624000 | - MMB: phys (0, 0 xa8624fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xa8625000 | - MMB: phys (0, 0 xaf6fefff), kvirt=0 x (null), flags=0 x00000000, length=115560 KB, name="VbPool
"Xaf6ff000 | - MMB: phys (0, 0 xaf6fffff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="vb_supp0
"Xaf700000 | - MMB: phys (0, 0 xaf70ffff), kvirt=0 x (null), flags=0 x00000000, length=64 KB, name="VirtReg0
"Xaf710000 | - MMB: phys (0, 0 xaf721fff), kvirt=0 x (null), flags=0 x00000000, length=72 KB, name="ISPStat
"Xaf722000 | - MMB: phys (0, 0 xaf726fff), kvirt=0 x (null), flags=0 x00000000, length=20 KB, name="ISPPrimStat
"Xaf727000 | - MMB: phys (0, 0 xaf736fff), kvirt=0 x (null), flags=0 x00000000, length=64 KB, name="proc_isp0
"Xaf737000 | - MMB: phys (0, 0 xaf737fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="ISPUpdateInfo
"Xaf738000 | - MMB: phys (0, 0 xaf738fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="ISPFrameInfo
"Xaf739000 | - MMB: phys (0, 0 xaf739fff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="VirtReg1
"Xaf73a000 | - MMB: phys (0, 0 xaf73afff), kvirt=0 x (null), flags=0 x00000000, length=4 KB, name="VirtReg2
"nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull